diff --git a/qrenderdoc/Windows/APIInspector.h b/qrenderdoc/Windows/APIInspector.h
index f0a627499..80ddd2b24 100644
--- a/qrenderdoc/Windows/APIInspector.h
+++ b/qrenderdoc/Windows/APIInspector.h
@@ -57,7 +57,7 @@ private:
   Ui::APIInspector *ui;
   ICaptureContext &m_Ctx;
 
-  uint32_t m_EventID;
+  uint32_t m_EventID = 0;
 
   void addCallstack(rdcarray<rdcstr> calls);
   void fillAPIView();
diff --git a/qrenderdoc/Windows/TextureViewer.h b/qrenderdoc/Windows/TextureViewer.h
index d21fe8d11..0a7384316 100644
--- a/qrenderdoc/Windows/TextureViewer.h
+++ b/qrenderdoc/Windows/TextureViewer.h
@@ -294,9 +294,9 @@ private:
 
   QSizeF m_PrevSize;
 
-  PixelValue m_CurRealValue;
-  PixelValue m_CurPixelValue;
-  PixelValue m_CurHoverValue;
+  PixelValue m_CurRealValue = {};
+  PixelValue m_CurPixelValue = {};
+  PixelValue m_CurHoverValue = {};
 
   QColor backCol;
 
diff --git a/renderdoc/api/replay/control_types.h b/renderdoc/api/replay/control_types.h
index ab3072bd3..de873f5a5 100644
--- a/renderdoc/api/replay/control_types.h
+++ b/renderdoc/api/replay/control_types.h
@@ -321,13 +321,13 @@ in-place, so it would be slice 0: sample 0, slice 0: sample 1, slice 1: sample 0
 This then follows the mapping for array slices as with any other array texture. :data:`sampleIndex`
 is ignored.
 )");
-  bool mapToArray;
+  bool mapToArray = false;
 
   DOCUMENT(R"(
 If :data:`mapToArray` is ``False`` this selects which sample should be extracted to treat as a
 normal 2D image. If set to :data:`ResolveSamples` then instead there's a default average resolve.
 )");
-  uint32_t sampleIndex;
+  uint32_t sampleIndex = ~0U;
 
   static const uint32_t ResolveSamples = ~0U;
 };