diff --git a/OpenCL/m01500_a1.cl b/OpenCL/m01500_a1.cl
index 9ef45dd89..7cbde72ed 100644
--- a/OpenCL/m01500_a1.cl
+++ b/OpenCL/m01500_a1.cl
@@ -342,7 +342,7 @@ __constant u32 c_skb[8][64] =
 #define BOX(i,n,S) (u32x) ((S)[(n)][(i).s0], (S)[(n)][(i).s1], (S)[(n)][(i).s2], (S)[(n)][(i).s3], (S)[(n)][(i).s4], (S)[(n)][(i).s5], (S)[(n)][(i).s6], (S)[(n)][(i).s7], (S)[(n)][(i).s8], (S)[(n)][(i).s9], (S)[(n)][(i).sa], (S)[(n)][(i).sb], (S)[(n)][(i).sc], (S)[(n)][(i).sd], (S)[(n)][(i).se], (S)[(n)][(i).sf])
 #endif
 
-void _des_crypt_keysetup (u32x c, u32x d, u32x Kc[16], u32x Kd[16], __local u32 (*s_skb)[64])
+static void _des_crypt_keysetup (u32x c, u32x d, u32x Kc[16], u32x Kd[16], __local u32 (*s_skb)[64])
 {
   u32x tt;
 
@@ -411,7 +411,7 @@ void _des_crypt_keysetup (u32x c, u32x d, u32x Kc[16], u32x Kd[16], __local u32
   }
 }
 
-void _des_crypt_encrypt (u32x iv[2], u32 mask, u32x Kc[16], u32x Kd[16], __local u32 (*s_SPtrans)[64])
+static void _des_crypt_encrypt (u32x iv[2], u32 mask, u32x Kc[16], u32x Kd[16], __local u32 (*s_SPtrans)[64])
 {
   const u32 E1 = (mask >> 2) & 0x3f0;
   const u32 E0 = mask & 0x3f;