diff --git a/src/compiler/glsl/tests/blob_test.c b/src/compiler/glsl/tests/blob_test.c
index 1cc97236e7e..21b8b1efdc1 100644
--- a/src/compiler/glsl/tests/blob_test.c
+++ b/src/compiler/glsl/tests/blob_test.c
@@ -28,6 +28,10 @@
 #include <stdlib.h>
 #include <stdbool.h>
 #include <string.h>
+#ifdef _MSC_VER
+#include <BaseTsd.h>
+typedef SSIZE_T ssize_t;
+#endif
 
 #include "util/ralloc.h"
 #include "blob.h"