diff --git a/src/dxvk/dxvk_compute.cpp b/src/dxvk/dxvk_compute.cpp
index 65eb75e35..39f58e557 100644
--- a/src/dxvk/dxvk_compute.cpp
+++ b/src/dxvk/dxvk_compute.cpp
@@ -101,7 +101,7 @@ namespace dxvk {
 
     auto csm = m_cs->createShaderModule(m_vkd, m_slotMapping, moduleInfo);
 
-    DxvkSpecConstantData specData;
+    DxvkSpecConstantData specData = { };
     
     for (uint32_t i = 0; i < MaxNumActiveBindings; i++)
       specData.activeBindings[i] = state.bsBindingMask.isBound(i) ? VK_TRUE : VK_FALSE;
@@ -159,4 +159,4 @@ namespace dxvk {
     m_pipeMgr->m_stateCache->addComputePipeline(key, state);
   }
   
-}
\ No newline at end of file
+}
diff --git a/src/dxvk/dxvk_graphics.cpp b/src/dxvk/dxvk_graphics.cpp
index cbb68a5ac..ed45b6374 100644
--- a/src/dxvk/dxvk_graphics.cpp
+++ b/src/dxvk/dxvk_graphics.cpp
@@ -184,7 +184,7 @@ namespace dxvk {
       sampleCount = VkSampleCountFlagBits(state.rsSampleCount);
     
     // Set up some specialization constants
-    DxvkSpecConstantData specData;
+    DxvkSpecConstantData specData = { };
     specData.rasterizerSampleCount = uint32_t(sampleCount);
     specData.alphaTestEnable       = state.xsAlphaCompareOp != VK_COMPARE_OP_ALWAYS;
     specData.alphaCompareOp        = state.xsAlphaCompareOp;