diff --git a/src/common/uniwin.h b/src/common/uniwin.h
index 095c325bcb..b7e2b52d52 100644
--- a/src/common/uniwin.h
+++ b/src/common/uniwin.h
@@ -35,9 +35,9 @@
 #include <direct.h> /* for _getcwd() and _chdir() */
 
 #ifdef _WIN64
-#define ssize_t __int64
+typedef __int64 ssize_t;
 #else
-#define ssize_t long
+typedef long ssize_t;
 #endif
 
 #define STDIN_FILENO 0