diff --git a/src/gallium/drivers/llvmpipe/lp_state_fs.c b/src/gallium/drivers/llvmpipe/lp_state_fs.c
index 83ff97659fb..b7e7e9c5d83 100644
--- a/src/gallium/drivers/llvmpipe/lp_state_fs.c
+++ b/src/gallium/drivers/llvmpipe/lp_state_fs.c
@@ -1601,7 +1601,7 @@ generate_unswizzled_blend(struct gallivm_state *gallivm,
    LLVMValueRef fs_src[4][TGSI_NUM_CHANNELS];
    LLVMValueRef fs_src1[4][TGSI_NUM_CHANNELS];
    LLVMValueRef src_alpha[4 * 4];
-   LLVMValueRef src1_alpha[4 * 4];
+   LLVMValueRef src1_alpha[4 * 4] = { NULL };
    LLVMValueRef src_mask[4 * 4];
    LLVMValueRef src[4 * 4];
    LLVMValueRef src1[4 * 4];