1 files changed, 4 insertions, 4 deletions
diff --git a/src/common/grfio.c b/src/common/grfio.c
index cb242fe5d..1d1ce756f 100644
--- a/src/common/grfio.c
+++ b/src/common/grfio.c
@@ -223,17 +223,17 @@ unsigned long grfio_crc32 (const unsigned char* buf, unsigned int len)
 
 ///////////////////////////////////////////////////////////////////////////////
 ///	Grf data sub : zip decode
-int decode_zip(unsigned char* dest, unsigned long* destLen, const unsigned char* source, unsigned long sourceLen)
+int decode_zip(void* dest, unsigned long* destLen, const void* source, unsigned long sourceLen)
 {
-	return uncompress(dest, destLen, source, sourceLen);
+	return uncompress((Bytef*)dest, destLen, (const Bytef*)source, sourceLen);
 }
 
 
 ///////////////////////////////////////////////////////////////////////////////
 ///	Grf data sub : zip encode 
-int encode_zip(unsigned char* dest, unsigned long* destLen, const unsigned char* source, unsigned long sourceLen)
+int encode_zip(void* dest, unsigned long* destLen, const void* source, unsigned long sourceLen)
 {
-	return compress(dest, destLen, source, sourceLen);
+	return compress((Bytef*)dest, destLen, (const Bytef*)source, sourceLen);
 }