diff --git a/msvc/ecl/config.h.msvc6 b/msvc/ecl/config.h.msvc6
index c44b49cfa..86f7a3e54 100755
--- a/msvc/ecl/config.h.msvc6
+++ b/msvc/ecl/config.h.msvc6
@@ -219,9 +219,9 @@ typedef unsigned char ecl_base_char;
 
 /* Missing integer types */
 #if _MSC_VER < 1900
-typedef char int8_t;
-typedef short int16_t;
-typedef int int32_t;
+typedef signed char int8_t;
+typedef signed short int16_t;
+typedef signed int int32_t;
 typedef unsigned char uint8_t;
 typedef unsigned short uint16_t;
 typedef unsigned int uint32_t;