diff --git a/lib/config-win32.h b/lib/config-win32.h
index 67375e0c94..5b2a4220ae 100644
--- a/lib/config-win32.h
+++ b/lib/config-win32.h
@@ -282,7 +282,8 @@
 /* Define as the return type of signal handlers (int or void).  */
 #define RETSIGTYPE void
 
-#if (defined(__WATCOMC__) && (__WATCOMC__ >= 1240)) || defined(__POCC__)
+#if (defined(__WATCOMC__) && (__WATCOMC__ >= 1240)) || defined(__POCC__) || \
+    defined(__MINGW32__)
 #elif defined(_WIN64)
 #define ssize_t __int64
 #else
diff --git a/src/config-win32.h b/src/config-win32.h
index 90ce7d6d8f..3884970784 100644
--- a/src/config-win32.h
+++ b/src/config-win32.h
@@ -141,7 +141,8 @@
 /* Define as the return type of signal handlers (int or void).  */
 #define RETSIGTYPE void
 
-#if (defined(__WATCOMC__) && (__WATCOMC__ >= 1240)) || defined(__POCC__)
+#if (defined(__WATCOMC__) && (__WATCOMC__ >= 1240)) || defined(__POCC__) || \
+    defined(__MINGW32__)
 #elif defined(_WIN64)
 #define ssize_t __int64
 #else