diff --git a/OpenCL/m07800_a0.cl b/OpenCL/m07800_a0.cl
index c3ce13975..63b062984 100644
--- a/OpenCL/m07800_a0.cl
+++ b/OpenCL/m07800_a0.cl
@@ -55,7 +55,7 @@ static void SETSHIFTEDINT (u32 *a, const int n, const u32 v)
   a[d + 1]  = l32_from_64_S (tmp);
 }
 
-void sha1_transform (const u32 w0[4], const u32 w1[4], const u32 w2[4], const u32 w3[4], u32 digest[5])
+static void sha1_transform (const u32 w0[4], const u32 w1[4], const u32 w2[4], const u32 w3[4], u32 digest[5])
 {
   u32 A = digest[0];
   u32 B = digest[1];
@@ -375,7 +375,7 @@ __kernel void m07800_m04 (__global pw_t *pws, __global const kernel_rule_t *rule
 
     u32 final_len = pw_len;
 
-    int i;
+    u32 i;
 
     // append MagicArray
 
@@ -635,7 +635,7 @@ __kernel void m07800_s04 (__global pw_t *pws, __global const kernel_rule_t *rule
 
     u32 final_len = pw_len;
 
-    int i;
+    u32 i;
 
     // append MagicArray