diff --git a/ext/gd/libgd/gd_compat.c b/ext/gd/libgd/gd_compat.c
index bba62341ca7..473ea203e5d 100644
--- a/ext/gd/libgd/gd_compat.c
+++ b/ext/gd/libgd/gd_compat.c
@@ -14,7 +14,7 @@ int gdJpegGetVersionInt()
 	return JPEG_LIB_VERSION;
 }
 
-int gdJpegGetVersionString()
+const char * gdJpegGetVersionString()
 {
 	switch(JPEG_LIB_VERSION) {
 		case 62:
diff --git a/ext/gd/libgd/gd_compat.h b/ext/gd/libgd/gd_compat.h
index 382db9c4948..959136efcf7 100644
--- a/ext/gd/libgd/gd_compat.h
+++ b/ext/gd/libgd/gd_compat.h
@@ -10,7 +10,7 @@
 
 
 const char * gdPngGetVersionString();
-int gdJpegGetVersionString();
+const char * gdJpegGetVersionString();
 int gdJpegGetVersionInt();
 int overflow2(int a, int b);