diff --git a/apps/speed.c b/apps/speed.c
index 5be02e8114..aace0c5712 100644
--- a/apps/speed.c
+++ b/apps/speed.c
@@ -63,8 +63,8 @@ VirtualLock(
     );
 #endif
 
-# if defined(OPENSSL_SYS_UNIX)
-#  include <sys/mman.h>
+#if defined(OPENSSL_SYS_LINUX)
+# include <sys/mman.h>
 #endif
 
 #include <openssl/bn.h>