diff --git a/src/harness/fourslash.ts b/src/harness/fourslash.ts
index a82346d888..2cd06e93d4 100644
--- a/src/harness/fourslash.ts
+++ b/src/harness/fourslash.ts
@@ -2122,31 +2122,31 @@ module FourSlash {
         public verifyOccurrencesAtPositionListContains(fileName: string, start: number, end: number, isWriteAccess?: boolean) {
             this.taoInvalidReason = 'verifyOccurrencesAtPositionListContains NYI';
 
-            let occurances = this.getOccurancesAtCurrentPosition();
+            let occurrences = this.getOccurancesAtCurrentPosition();
 
-            if (!occurances || occurances.length === 0) {
+            if (!occurrences || occurrences.length === 0) {
                 this.raiseError('verifyOccurancesAtPositionListContains failed - found 0 references, expected at least one.');
             }
 
-            for (let i = 0; i < occurances.length; i++) {
-                let occurance = occurances[i];
-                if (occurance && occurance.fileName === fileName && occurance.textSpan.start === start && ts.textSpanEnd(occurance.textSpan) === end) {
-                    if (typeof isWriteAccess !== "undefined" && occurance.isWriteAccess !== isWriteAccess) {
-                        this.raiseError('verifyOccurancesAtPositionListContains failed - item isWriteAccess value does not match, actual: ' + occurance.isWriteAccess + ', expected: ' + isWriteAccess + '.');
+            for (let i = 0; i < occurrences.length; i++) {
+                let occurrence = occurrences[i];
+                if (occurrence && occurrence.fileName === fileName && occurrence.textSpan.start === start && ts.textSpanEnd(occurrence.textSpan) === end) {
+                    if (typeof isWriteAccess !== "undefined" && occurrence.isWriteAccess !== isWriteAccess) {
+                        this.raiseError('verifyOccurrencesAtPositionListContains failed - item isWriteAccess value does not match, actual: ' + occurrence.isWriteAccess + ', expected: ' + isWriteAccess + '.');
                     }
                     return;
                 }
             }
 
             let missingItem = { fileName: fileName, start: start, end: end, isWriteAccess: isWriteAccess };
-            this.raiseError('verifyOccurancesAtPositionListContains failed - could not find the item: ' + JSON.stringify(missingItem) + ' in the returned list: (' + JSON.stringify(occurances) + ')');
+            this.raiseError('verifyOccurrencesAtPositionListContains failed - could not find the item: ' + JSON.stringify(missingItem) + ' in the returned list: (' + JSON.stringify(occurrences) + ')');
         }
 
         public verifyOccurrencesAtPositionListCount(expectedCount: number) {
             this.taoInvalidReason = 'verifyOccurrencesAtPositionListCount NYI';
 
-            let occurances = this.getOccurancesAtCurrentPosition();
-            let actualCount = occurances ? occurances.length : 0;
+            let occurrences = this.getOccurancesAtCurrentPosition();
+            let actualCount = occurrences ? occurrences.length : 0;
             if (expectedCount !== actualCount) {
                 this.raiseError('verifyOccurrencesAtPositionListCount failed - actual: ' + actualCount + ', expected:' + expectedCount);
             }