diff --git a/OpenCL/m05300_a1.cl b/OpenCL/m05300_a1.cl
index 46380feb6..cdc88c60b 100644
--- a/OpenCL/m05300_a1.cl
+++ b/OpenCL/m05300_a1.cl
@@ -14,7 +14,7 @@
 #include "inc_common.cl"
 #include "inc_simd.cl"
 
-void md5_transform (const u32x w0[4], const u32x w1[4], const u32x w2[4], const u32x w3[4], u32x digest[4])
+static void md5_transform (const u32x w0[4], const u32x w1[4], const u32x w2[4], const u32x w3[4], u32x digest[4])
 {
   u32x a = digest[0];
   u32x b = digest[1];
@@ -112,7 +112,7 @@ void md5_transform (const u32x w0[4], const u32x w1[4], const u32x w2[4], const
   digest[3] += d;
 }
 
-void hmac_md5_pad (u32x w0[4], u32x w1[4], u32x w2[4], u32x w3[4], u32x ipad[4], u32x opad[4])
+static void hmac_md5_pad (u32x w0[4], u32x w1[4], u32x w2[4], u32x w3[4], u32x ipad[4], u32x opad[4])
 {
   w0[0] = w0[0] ^ 0x36363636;
   w0[1] = w0[1] ^ 0x36363636;
@@ -163,7 +163,7 @@ void hmac_md5_pad (u32x w0[4], u32x w1[4], u32x w2[4], u32x w3[4], u32x ipad[4],
   md5_transform (w0, w1, w2, w3, opad);
 }
 
-void hmac_md5_run (u32x w0[4], u32x w1[4], u32x w2[4], u32x w3[4], u32x ipad[4], u32x opad[4], u32x digest[4])
+static void hmac_md5_run (u32x w0[4], u32x w1[4], u32x w2[4], u32x w3[4], u32x ipad[4], u32x opad[4], u32x digest[4])
 {
   digest[0] = ipad[0];
   digest[1] = ipad[1];