3 files changed, 3 insertions, 3 deletions
diff --git a/src/jpeg.c b/src/jpeg.c
index fb9e0ca5..d6f7cd7a 100644
--- a/src/jpeg.c
+++ b/src/jpeg.c
@@ -421,6 +421,6 @@ static void Jpeg_write(DilloJpeg *jpeg, void *Buf, uint_t BufSize)
 
 void *a_Jpeg_new() { return 0; }
 void a_Jpeg_callback() { return; }
-const char *a_Jpeg_version(void) { return NULL; }
+const char *a_Jpeg_version(void) { return 0; }
 
 #endif /* ENABLE_JPEG */
diff --git a/src/png.c b/src/png.c
index 2aedc374..a1c3f3f1 100644
--- a/src/png.c
+++ b/src/png.c
@@ -471,6 +471,6 @@ void *a_Png_new(DilloImage *Image, DilloUrl *url, int version)
 
 void *a_Png_new() { return 0; }
 void a_Png_callback() { return; }
-const char *a_Png_version(void) { return NULL; }
+const char *a_Png_version(void) { return 0; }
 
 #endif /* ENABLE_PNG */
diff --git a/src/webp.c b/src/webp.c
index bd0ad88d..77e6c7cf 100644
--- a/src/webp.c
+++ b/src/webp.c
@@ -215,6 +215,6 @@ void *a_Webp_new(DilloImage *Image, DilloUrl *url, int version)
 
 void *a_Webp_new() { return 0; }
 void a_Webp_callback() { return; }
-const char *a_Webp_version(char *buf, int n) { return NULL; }
+const char *a_Webp_version(char *buf, int n) { return 0; }
 
 #endif /* ENABLE_WEBP */