diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
index 3d13ba63fa..867eebb04a 100644
--- a/src/compiler/checker.ts
+++ b/src/compiler/checker.ts
@@ -922,6 +922,7 @@ namespace ts {
                     if (!errorLocation ||
                         !checkAndReportErrorForMissingPrefix(errorLocation, name, nameArg) &&
                         !checkAndReportErrorForExtendingInterface(errorLocation) &&
+                        !checkAndReportErrorForUsingTypeAsNamespace(errorLocation, name, meaning) &&
                         !checkAndReportErrorForUsingTypeAsValue(errorLocation, name, meaning)) {
                         error(errorLocation, nameNotFoundMessage, typeof nameArg === "string" ? nameArg : declarationNameToString(nameArg));
                     }
@@ -1032,6 +1033,18 @@ namespace ts {
             }
         }
 
+        function checkAndReportErrorForUsingTypeAsNamespace(errorLocation: Node, name: string, meaning: SymbolFlags): boolean {
+            if (meaning === SymbolFlags.Namespace) {
+                const symbol = resolveSymbol(resolveName(errorLocation, name, SymbolFlags.Type & ~SymbolFlags.Value, /*nameNotFoundMessage*/undefined, /*nameArg*/ undefined));
+                if (symbol) {
+                    error(errorLocation, Diagnostics._0_only_refers_to_a_type_but_is_being_used_as_a_namespace_here, name);
+                    return true;
+                }
+            }
+
+            return false;
+        }
+
         function checkAndReportErrorForUsingTypeAsValue(errorLocation: Node, name: string, meaning: SymbolFlags): boolean {
             if (meaning & (SymbolFlags.Value & ~SymbolFlags.NamespaceModule)) {
                 const symbol = resolveSymbol(resolveName(errorLocation, name, SymbolFlags.Type & ~SymbolFlags.Value, /*nameNotFoundMessage*/undefined, /*nameArg*/ undefined));
diff --git a/src/compiler/diagnosticMessages.json b/src/compiler/diagnosticMessages.json
index b823b1ed6b..5a22d7d40d 100644
--- a/src/compiler/diagnosticMessages.json
+++ b/src/compiler/diagnosticMessages.json
@@ -1995,6 +1995,10 @@
         "category": "Error",
         "code": 2701
     },
+    "'{0}' only refers to a type, but is being used as a namespace here.": {
+        "category": "Error",
+        "code": 2702
+    },
 
     "Import declaration '{0}' is using private name '{1}'.": {
         "category": "Error",
diff --git a/tests/baselines/reference/invalidImportAliasIdentifiers.errors.txt b/tests/baselines/reference/invalidImportAliasIdentifiers.errors.txt
index bf5cf5c0f1..c69cc85ad9 100644
--- a/tests/baselines/reference/invalidImportAliasIdentifiers.errors.txt
+++ b/tests/baselines/reference/invalidImportAliasIdentifiers.errors.txt
@@ -1,6 +1,6 @@
 tests/cases/conformance/internalModules/importDeclarations/invalidImportAliasIdentifiers.ts(5,12): error TS2503: Cannot find namespace 'V'.
 tests/cases/conformance/internalModules/importDeclarations/invalidImportAliasIdentifiers.ts(11,12): error TS2503: Cannot find namespace 'C'.
-tests/cases/conformance/internalModules/importDeclarations/invalidImportAliasIdentifiers.ts(23,12): error TS2693: 'I' only refers to a type, but is being used as a value here.
+tests/cases/conformance/internalModules/importDeclarations/invalidImportAliasIdentifiers.ts(23,12): error TS2702: 'I' only refers to a type, but is being used as a namespace here.
 
 
 ==== tests/cases/conformance/internalModules/importDeclarations/invalidImportAliasIdentifiers.ts (3 errors) ====
@@ -32,5 +32,5 @@ tests/cases/conformance/internalModules/importDeclarations/invalidImportAliasIde
     
     import i = I;
                ~
-!!! error TS2693: 'I' only refers to a type, but is being used as a value here.
+!!! error TS2702: 'I' only refers to a type, but is being used as a namespace here.
     
\ No newline at end of file
diff --git a/tests/baselines/reference/invalidUseOfTypeAsNamespace.errors.txt b/tests/baselines/reference/invalidUseOfTypeAsNamespace.errors.txt
new file mode 100644
index 0000000000..0353d46d63
--- /dev/null
+++ b/tests/baselines/reference/invalidUseOfTypeAsNamespace.errors.txt
@@ -0,0 +1,11 @@
+tests/cases/compiler/invalidUseOfTypeAsNamespace.ts(4,16): error TS2702: 'OhNo' only refers to a type, but is being used as a namespace here.
+
+
+==== tests/cases/compiler/invalidUseOfTypeAsNamespace.ts (1 errors) ====
+    interface OhNo {
+    }
+    
+    declare let y: OhNo.hello;
+                   ~~~~
+!!! error TS2702: 'OhNo' only refers to a type, but is being used as a namespace here.
+    
\ No newline at end of file
diff --git a/tests/baselines/reference/invalidUseOfTypeAsNamespace.js b/tests/baselines/reference/invalidUseOfTypeAsNamespace.js
new file mode 100644
index 0000000000..3b598fdea9
--- /dev/null
+++ b/tests/baselines/reference/invalidUseOfTypeAsNamespace.js
@@ -0,0 +1,8 @@
+//// [invalidUseOfTypeAsNamespace.ts]
+interface OhNo {
+}
+
+declare let y: OhNo.hello;
+
+
+//// [invalidUseOfTypeAsNamespace.js]
diff --git a/tests/baselines/reference/strictModeReservedWordInClassDeclaration.errors.txt b/tests/baselines/reference/strictModeReservedWordInClassDeclaration.errors.txt
index 0dff64c9a3..fafffb563e 100644
--- a/tests/baselines/reference/strictModeReservedWordInClassDeclaration.errors.txt
+++ b/tests/baselines/reference/strictModeReservedWordInClassDeclaration.errors.txt
@@ -16,9 +16,9 @@ tests/cases/compiler/strictModeReservedWordInClassDeclaration.ts(21,9): error TS
 tests/cases/compiler/strictModeReservedWordInClassDeclaration.ts(21,17): error TS1213: Identifier expected. 'private' is a reserved word in strict mode. Class definitions are automatically in strict mode.
 tests/cases/compiler/strictModeReservedWordInClassDeclaration.ts(23,20): error TS1213: Identifier expected. 'public' is a reserved word in strict mode. Class definitions are automatically in strict mode.
 tests/cases/compiler/strictModeReservedWordInClassDeclaration.ts(25,20): error TS1213: Identifier expected. 'public' is a reserved word in strict mode. Class definitions are automatically in strict mode.
-tests/cases/compiler/strictModeReservedWordInClassDeclaration.ts(25,20): error TS2693: 'public' only refers to a type, but is being used as a value here.
+tests/cases/compiler/strictModeReservedWordInClassDeclaration.ts(25,20): error TS2702: 'public' only refers to a type, but is being used as a namespace here.
 tests/cases/compiler/strictModeReservedWordInClassDeclaration.ts(26,21): error TS1213: Identifier expected. 'public' is a reserved word in strict mode. Class definitions are automatically in strict mode.
-tests/cases/compiler/strictModeReservedWordInClassDeclaration.ts(26,21): error TS2693: 'public' only refers to a type, but is being used as a value here.
+tests/cases/compiler/strictModeReservedWordInClassDeclaration.ts(26,21): error TS2702: 'public' only refers to a type, but is being used as a namespace here.
 tests/cases/compiler/strictModeReservedWordInClassDeclaration.ts(27,17): error TS1213: Identifier expected. 'package' is a reserved word in strict mode. Class definitions are automatically in strict mode.
 tests/cases/compiler/strictModeReservedWordInClassDeclaration.ts(27,17): error TS2304: Cannot find name 'package'.
 tests/cases/compiler/strictModeReservedWordInClassDeclaration.ts(28,17): error TS1213: Identifier expected. 'package' is a reserved word in strict mode. Class definitions are automatically in strict mode.
@@ -88,12 +88,12 @@ tests/cases/compiler/strictModeReservedWordInClassDeclaration.ts(28,17): error T
                        ~~~~~~
 !!! error TS1213: Identifier expected. 'public' is a reserved word in strict mode. Class definitions are automatically in strict mode.
                        ~~~~~~
-!!! error TS2693: 'public' only refers to a type, but is being used as a value here.
+!!! error TS2702: 'public' only refers to a type, but is being used as a namespace here.
     class F1 implements public.private.implements { }
                         ~~~~~~
 !!! error TS1213: Identifier expected. 'public' is a reserved word in strict mode. Class definitions are automatically in strict mode.
                         ~~~~~~
-!!! error TS2693: 'public' only refers to a type, but is being used as a value here.
+!!! error TS2702: 'public' only refers to a type, but is being used as a namespace here.
     class G extends package { }
                     ~~~~~~~
 !!! error TS1213: Identifier expected. 'package' is a reserved word in strict mode. Class definitions are automatically in strict mode.
diff --git a/tests/cases/compiler/invalidUseOfTypeAsNamespace.ts b/tests/cases/compiler/invalidUseOfTypeAsNamespace.ts
new file mode 100644
index 0000000000..5391715cb3
--- /dev/null
+++ b/tests/cases/compiler/invalidUseOfTypeAsNamespace.ts
@@ -0,0 +1,4 @@
+interface OhNo {
+}
+
+declare let y: OhNo.hello;