diff --git a/source/lib/sysdep/x86_x64/x86_x64.cpp b/source/lib/sysdep/x86_x64/x86_x64.cpp
index 3cc74ba8db..c307b1b2bf 100644
--- a/source/lib/sysdep/x86_x64/x86_x64.cpp
+++ b/source/lib/sysdep/x86_x64/x86_x64.cpp
@@ -30,8 +30,9 @@
 # endif
 
 #if MSC_VERSION
-# include <intrin.h>
+# include <intrin.h>	// __rdtsc
 #elif GCC_VERSION
+# include <emmintrin.h>
 #else
 # error compiler not supported
 #endif