diff --git a/gdi_canvas.c b/gdi_canvas.c
index f67aadf..64fbbf5 100644
--- a/gdi_canvas.c
+++ b/gdi_canvas.c
@@ -16,6 +16,9 @@
    License along with this library; if not, see <http://www.gnu.org/licenses/>.
 */
 #ifdef HAVE_CONFIG_H
+#ifdef __MINGW32__
+#undef HAVE_STDLIB_H
+#endif
 #include <config.h>
 #endif
 
diff --git a/sw_canvas.c b/sw_canvas.c
index 651c52b..0f67c80 100644
--- a/sw_canvas.c
+++ b/sw_canvas.c
@@ -16,6 +16,9 @@
    License along with this library; if not, see <http://www.gnu.org/licenses/>.
 */
 #ifdef HAVE_CONFIG_H
+#ifdef __MINGW32__
+#undef HAVE_STDLIB_H
+#endif
 #include <config.h>
 #endif