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-rw-r--r--test/write-png.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/test/write-png.h b/test/write-png.h
index fe0e92b20..8074666a3 100644
--- a/test/write-png.h
+++ b/test/write-png.h
@@ -29,7 +29,7 @@
#define WRITE_PNG_H
void
-write_png_argb32 (char *buffer, FILE * file,
+write_png_argb32 (unsigned char *buffer, FILE * file,
int width, int height, int stride);
#endif