diff --git a/src/include/cpu/x86/tsc.h b/src/include/cpu/x86/tsc.h
index fdf6d74e64..96afaa6e7d 100644
--- a/src/include/cpu/x86/tsc.h
+++ b/src/include/cpu/x86/tsc.h
@@ -17,7 +17,7 @@ static tsc_t rdtsc(void)
 	return res;
 }
 
-#ifndef ROMCC
+#ifndef __ROMCC__
 static inline unsigned long long rdtscll(void)
 {
 	unsigned long long val;