diff --git a/intern/smoke/intern/WAVELET_NOISE.h b/intern/smoke/intern/WAVELET_NOISE.h
index fce901b..1f73c5e 100644
--- a/intern/smoke/intern/WAVELET_NOISE.h
+++ b/intern/smoke/intern/WAVELET_NOISE.h
@@ -43,6 +43,7 @@
 #ifndef WAVELET_NOISE_H
 #define WAVELET_NOISE_H
 
+#include <string.h>
 #include <MERSENNETWISTER.h>
 
 #ifdef WIN32