diff --git a/src/readosm.c b/src/readosm.c
index e1dda27..7977339 100644
--- a/src/readosm.c
+++ b/src/readosm.c
@@ -50,7 +50,7 @@
 
 #if defined(_WIN32) && !defined(__MINGW32__)
 /* MSVC: avoiding to include at all config.h */
-#define VERSION	1.1.0
+#define VERSION	"1.1.0"
 #else
 #include "config.h"
 #endif
