diff --git a/desmume/src/utils/md5.cpp b/desmume/src/utils/md5.cpp
index 144536c2f..54efd3a25 100644
--- a/desmume/src/utils/md5.cpp
+++ b/desmume/src/utils/md5.cpp
@@ -42,7 +42,7 @@ void md5_starts( struct md5_context *ctx )
     ctx->state[3] = 0x10325476;
 }
 
-void md5_process( struct md5_context *ctx, uint8 data[64] )
+static void md5_process( struct md5_context *ctx, uint8 data[64] )
 {
     uint32 A, B, C, D, X[16];