diff --git a/OpenCL/m02500.cl b/OpenCL/m02500.cl
index 1d92fd877..0c766e90c 100644
--- a/OpenCL/m02500.cl
+++ b/OpenCL/m02500.cl
@@ -384,6 +384,11 @@ __kernel void m02500_comp (__global pw_t *pws, __global const kernel_rule_t *rul
 
     u32 keymic[4];
 
+    keymic[0] = 0;
+    keymic[1] = 0;
+    keymic[2] = 0;
+    keymic[3] = 0;
+
     if (wpa->keyver == 1)
     {
       sha1_hmac_ctx_t ctx1;
@@ -658,6 +663,11 @@ __kernel void m02500_comp (__global pw_t *pws, __global const kernel_rule_t *rul
 
     u32 keymic[4];
 
+    keymic[0] = 0;
+    keymic[1] = 0;
+    keymic[2] = 0;
+    keymic[3] = 0;
+
     if (wpa->keyver == 1)
     {
       sha1_hmac_ctx_t ctx1;
diff --git a/OpenCL/m02501.cl b/OpenCL/m02501.cl
index 839831493..d7eed5eb1 100644
--- a/OpenCL/m02501.cl
+++ b/OpenCL/m02501.cl
@@ -258,6 +258,11 @@ __kernel void m02501_comp (__global pw_t *pws, __global const kernel_rule_t *rul
 
     u32 keymic[4];
 
+    keymic[0] = 0;
+    keymic[1] = 0;
+    keymic[2] = 0;
+    keymic[3] = 0;
+
     if (wpa->keyver == 1)
     {
       sha1_hmac_ctx_t ctx1;
@@ -532,6 +537,11 @@ __kernel void m02501_comp (__global pw_t *pws, __global const kernel_rule_t *rul
 
     u32 keymic[4];
 
+    keymic[0] = 0;
+    keymic[1] = 0;
+    keymic[2] = 0;
+    keymic[3] = 0;
+
     if (wpa->keyver == 1)
     {
       sha1_hmac_ctx_t ctx1;