diff --git a/include/ircd/ctx/prof.h b/include/ircd/ctx/prof.h
index 87694df66..b204605f1 100644
--- a/include/ircd/ctx/prof.h
+++ b/include/ircd/ctx/prof.h
@@ -33,7 +33,7 @@ namespace ircd::ctx::prof
 	struct ticker;
 
 	// util
-	ulong rdtsc();
+	unsigned long long rdtsc();
 	string_view reflect(const event &);
 
 	// totals
@@ -97,3 +97,19 @@ struct ircd::ctx::prof::ticker
 	// monotonic counters for events
 	std::array<uint64_t, num_of<prof::event>()> event {{0}};
 };
+
+#if defined(__x86_64__) || defined(__i386__)
+inline unsigned long long
+__attribute__((flatten, always_inline, gnu_inline, artificial))
+ircd::ctx::prof::rdtsc()
+{
+	return __builtin_ia32_rdtsc();
+}
+#else
+inline unsigned long long
+ircd::ctx::prof::rdtsc()
+{
+	static_assert(false, "TODO: Implement fallback here");
+	return 0;
+}
+#endif
diff --git a/ircd/ctx.cc b/ircd/ctx.cc
index af0567d85..cf5873a94 100644
--- a/ircd/ctx.cc
+++ b/ircd/ctx.cc
@@ -1867,25 +1867,6 @@ ircd::ctx::prof::reflect(const event &e)
 	return "?????";
 }
 
-#ifdef HAVE_X86INTRIN_H
-ulong
-ircd::ctx::prof::rdtsc()
-{
-	return __rdtsc();
-}
-#else
-ulong
-ircd::ctx::prof::rdtsc()
-{
-	static_assert
-	(
-		0, "TODO: Implement fallback here"
-	);
-
-	return 0;
-}
-#endif
-
 ///////////////////////////////////////////////////////////////////////////////
 //
 // ctx_ole.h