diff --git a/src/Globals.h b/src/Globals.h
index c5768facf..0c11429bd 100644
--- a/src/Globals.h
+++ b/src/Globals.h
@@ -71,9 +71,24 @@
 	
 	#define FORMATSTRING(formatIndex, va_argsIndex) __attribute__((format (printf, formatIndex, va_argsIndex)))
 
-	#define SIZE_T_FMT "%zu"
-	#define SIZE_T_FMT_PRECISION(x) "%" #x "zu"
-	#define SIZE_T_FMT_HEX "%zx"
+	#if defined(_WIN32)
+		// We're compiling on MinGW, which uses an old MSVCRT library that has no support for size_t printfing.
+		// We need direct size formats:
+		#if defined(_WIN64)
+			#define SIZE_T_FMT "%I64u"
+			#define SIZE_T_FMT_PRECISION(x) "%" #x "I64u"
+			#define SIZE_T_FMT_HEX "%I64x"
+		#else
+			#define SIZE_T_FMT "%u"
+			#define SIZE_T_FMT_PRECISION(x) "%" #x "u"
+			#define SIZE_T_FMT_HEX "%x"
+		#endif
+	#else
+		// We're compiling on Linux, so we can use libc's size_t printf format:
+		#define SIZE_T_FMT "%zu"
+		#define SIZE_T_FMT_PRECISION(x) "%" #x "zu"
+		#define SIZE_T_FMT_HEX "%zx"
+	#endif
 	
 	#define NORETURN      __attribute((__noreturn__))