diff --git a/src/Makefile b/src/Makefile
index 168feb17c..e936a399c 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -250,13 +250,11 @@ CFLAGS_CROSS_WIN32      += -I$(OPENCL_HEADERS_KHRONOS)/
 CFLAGS_CROSS_WIN32      += -I$(WIN_ICONV_32)/include/
 CFLAGS_CROSS_WIN32      += -m32
 CFLAGS_CROSS_WIN32      += -DWITH_HWMON
-CFLAGS_CROSS_WIN32      += -D_CRT_RAND_S
 CFLAGS_CROSS_WIN64      := $(CFLAGS)
 CFLAGS_CROSS_WIN64      += -I$(OPENCL_HEADERS_KHRONOS)/
 CFLAGS_CROSS_WIN64      += -I$(WIN_ICONV_64)/include/
 CFLAGS_CROSS_WIN64      += -m64
 CFLAGS_CROSS_WIN64      += -DWITH_HWMON
-CFLAGS_CROSS_WIN64      += -D_CRT_RAND_S
 
 LFLAGS_CROSS_LINUX32    := $(LFLAGS)
 LFLAGS_CROSS_LINUX32    += -lpthread
diff --git a/src/shared.c b/src/shared.c
index c49ee3ed8..e11f4df1d 100644
--- a/src/shared.c
+++ b/src/shared.c
@@ -381,10 +381,7 @@ u32 get_random_num (const u32 min, const u32 max)
 
   #if defined (_WIN)
 
-  u32 r;
-  rand_s(&r);
-
-  return ((r % (max - min)) + min);
+  return (((u32) rand () % (max - min)) + min);
 
   #else