diff --git a/reactos/tools/hhpcomp/chmc/chmc.c b/reactos/tools/hhpcomp/chmc/chmc.c
index 75d8f4ed058..652031c477b 100644
--- a/reactos/tools/hhpcomp/chmc/chmc.c
+++ b/reactos/tools/hhpcomp/chmc/chmc.c
@@ -30,7 +30,7 @@
 #include <stdlib.h>
 #include <sys/types.h>
 #include <sys/stat.h>
-#ifndef __GNUC__
+#if !defined(__GNUC__) || defined(__MINGW32__)
 typedef int (*__compar_fn_t)(const void *, const void *);
 #endif
 
diff --git a/reactos/tools/hhpcomp/utils.cpp b/reactos/tools/hhpcomp/utils.cpp
index 184742c073a..c2c8dae8d17 100644
--- a/reactos/tools/hhpcomp/utils.cpp
+++ b/reactos/tools/hhpcomp/utils.cpp
@@ -22,6 +22,7 @@
 #include <stdexcept>
 
 #if defined(_WIN32)
+    #define WIN32_LEAN_AND_MEAN
     #include <windows.h>  // for GetFullPathNameA 
 #else
     #include <unistd.h>