diff --git a/OpenCL/m05400_a0.cl b/OpenCL/m05400_a0.cl
index 24924b2c2..9bc18dba6 100644
--- a/OpenCL/m05400_a0.cl
+++ b/OpenCL/m05400_a0.cl
@@ -16,7 +16,7 @@
 #include "inc_rp.cl"
 #include "inc_simd.cl"
 
-void sha1_transform (const u32x w0[4], const u32x w1[4], const u32x w2[4], const u32x w3[4], u32x digest[5])
+static void sha1_transform (const u32x w0[4], const u32x w1[4], const u32x w2[4], const u32x w3[4], u32x digest[5])
 {
   u32x A = digest[0];
   u32x B = digest[1];
@@ -144,7 +144,7 @@ void sha1_transform (const u32x w0[4], const u32x w1[4], const u32x w2[4], const
   digest[4] += E;
 }
 
-void hmac_sha1_pad (u32x w0[4], u32x w1[4], u32x w2[4], u32x w3[4], u32x ipad[5], u32x opad[5])
+static void hmac_sha1_pad (u32x w0[4], u32x w1[4], u32x w2[4], u32x w3[4], u32x ipad[5], u32x opad[5])
 {
   w0[0] = w0[0] ^ 0x36363636;
   w0[1] = w0[1] ^ 0x36363636;
@@ -197,7 +197,7 @@ void hmac_sha1_pad (u32x w0[4], u32x w1[4], u32x w2[4], u32x w3[4], u32x ipad[5]
   sha1_transform (w0, w1, w2, w3, opad);
 }
 
-void hmac_sha1_run (u32x w0[4], u32x w1[4], u32x w2[4], u32x w3[4], u32x ipad[5], u32x opad[5], u32x digest[5])
+static void hmac_sha1_run (u32x w0[4], u32x w1[4], u32x w2[4], u32x w3[4], u32x ipad[5], u32x opad[5], u32x digest[5])
 {
   digest[0] = ipad[0];
   digest[1] = ipad[1];