diff --git a/examples/cwebp.c b/examples/cwebp.c
index 2fd31203..1d3ae477 100644
--- a/examples/cwebp.c
+++ b/examples/cwebp.c
@@ -283,6 +283,8 @@ static int ReadJPEG(FILE* in_file, WebPPicture* const pic) {
 
 #else
 static int ReadJPEG(FILE* in_file, WebPPicture* const pic) {
+  (void)in_file;
+  (void)pic;
   printf("JPEG support not compiled. Please install the libjpeg development "
          "package before building.\n");
   return 0;
@@ -378,6 +380,9 @@ static int ReadPNG(FILE* in_file, WebPPicture* const pic, int keep_alpha) {
 }
 #else
 static int ReadPNG(FILE* in_file, WebPPicture* const pic, int keep_alpha) {
+  (void)in_file;
+  (void)pic;
+  (void)keep_alpha;
   printf("PNG support not compiled. Please install the libpng development "
          "package before building.\n");
   return 0;
diff --git a/examples/dwebp.c b/examples/dwebp.c
index 406b0e4c..4252fe4e 100644
--- a/examples/dwebp.c
+++ b/examples/dwebp.c
@@ -186,6 +186,8 @@ static int WritePNG(FILE* out_file, const WebPDecBuffer* const buffer) {
 typedef uint32_t png_uint_32;
 
 static int WritePNG(FILE* out_file, const WebPDecBuffer* const buffer) {
+  (void)out_file;
+  (void)buffer;
   printf("PNG support not compiled. Please install the libpng development "
          "package before building.\n");
   printf("You can run with -ppm flag to decode in PPM format.\n");