diff --git a/renderdoc/driver/d3d12/d3d12_debug.h b/renderdoc/driver/d3d12/d3d12_debug.h
index 35dfb386a..1e6ff095a 100644
--- a/renderdoc/driver/d3d12/d3d12_debug.h
+++ b/renderdoc/driver/d3d12/d3d12_debug.h
@@ -111,8 +111,8 @@ struct MeshDisplayPipelines
     ePipe_Count,
   };
 
-  ID3D12PipelineState *pipes[ePipe_Count];
-  ID3D12RootSignature *rootsig;
+  ID3D12PipelineState *pipes[ePipe_Count] = {};
+  ID3D12RootSignature *rootsig = NULL;
 };
 
 class D3D12DebugManager
diff --git a/renderdoc/driver/vulkan/vk_debug.h b/renderdoc/driver/vulkan/vk_debug.h
index 3feead445..72c5f0ef9 100644
--- a/renderdoc/driver/vulkan/vk_debug.h
+++ b/renderdoc/driver/vulkan/vk_debug.h
@@ -43,7 +43,7 @@ struct MeshDisplayPipelines
     ePipe_Count,
   };
 
-  VkPipeline pipes[ePipe_Count];
+  VkPipeline pipes[ePipe_Count] = {};
 };
 
 struct SPIRVCompilationSettings;