diff --git a/apps/openmw/mwsound/openal_output.cpp b/apps/openmw/mwsound/openal_output.cpp
index 31d46ce311..f4587130e0 100644
--- a/apps/openmw/mwsound/openal_output.cpp
+++ b/apps/openmw/mwsound/openal_output.cpp
@@ -387,7 +387,7 @@ private:
 OpenAL_SoundStream::OpenAL_SoundStream(ALuint src, DecoderPtr decoder)
   : mSource(src), mCurrentBufIdx(0), mFormat(AL_NONE), mSampleRate(0)
   , mBufferSize(0), mFrameSize(0), mSilence(0), mDecoder(std::move(decoder))
-  , mLoudnessAnalyzer(nullptr)
+  , mLoudnessAnalyzer(nullptr), mIsFinished(true)
 {
     mBuffers.fill(0);
 }
diff --git a/components/esm/loadland.hpp b/components/esm/loadland.hpp
index 2163c30fc7..cccb472de9 100644
--- a/components/esm/loadland.hpp
+++ b/components/esm/loadland.hpp
@@ -83,7 +83,12 @@ struct Land
     struct LandData
     {
         LandData()
-            : mDataLoaded(0)
+            : mHeightOffset(0)
+            , mMinHeight(0)
+            , mMaxHeight(0)
+            , mUnk1(0)
+            , mUnk2(0)
+            , mDataLoaded(0)
         {
         }
 
diff --git a/components/esm/loadpgrd.hpp b/components/esm/loadpgrd.hpp
index d1003eb865..4e74c9a24d 100644
--- a/components/esm/loadpgrd.hpp
+++ b/components/esm/loadpgrd.hpp
@@ -36,7 +36,10 @@ struct Pathgrid
         Point& operator=(const float[3]);
         Point(const float[3]);
         Point();
-        Point(int x, int y, int z) : mX(x), mY(y), mZ(z) {}
+        Point(int x, int y, int z)
+            : mX(x), mY(y), mZ(z)
+            , mAutogenerated(0), mConnectionNum(0), mUnknown(0)
+        {}
     }; // 16 bytes
 
     struct Edge // path grid edge
diff --git a/components/esm/objectstate.hpp b/components/esm/objectstate.hpp
index b8eb138ebe..d14c04b648 100644
--- a/components/esm/objectstate.hpp
+++ b/components/esm/objectstate.hpp
@@ -34,7 +34,9 @@ namespace ESM
 
         ESM::AnimationState mAnimationState;
 
-        ObjectState() : mHasCustomState(true), mVersion(0)
+        ObjectState()
+        : mHasLocals(0), mEnabled(0), mCount(0)
+        , mFlags(0), mHasCustomState(true), mVersion(0)
         {}
 
         /// @note Does not load the CellRef ID, it should already be loaded before calling this method
diff --git a/components/esmterrain/storage.cpp b/components/esmterrain/storage.cpp
index 52850fd746..ff3123c5b8 100644
--- a/components/esmterrain/storage.cpp
+++ b/components/esmterrain/storage.cpp
@@ -24,6 +24,8 @@ namespace ESMTerrain
     };
 
     LandObject::LandObject()
+        : mLand(nullptr)
+        , mLoadFlags(0)
     {
     }
 
diff --git a/components/terrain/quadtreenode.cpp b/components/terrain/quadtreenode.cpp
index 0394adea7f..f4fc8df897 100644
--- a/components/terrain/quadtreenode.cpp
+++ b/components/terrain/quadtreenode.cpp
@@ -61,6 +61,7 @@ QuadTreeNode::QuadTreeNode(QuadTreeNode* parent, ChildDirection direction, float
     , mValidBounds(false)
     , mSize(size)
     , mCenter(center)
+    , mViewDataMap(nullptr)
 {
     for (unsigned int i=0; i<4; ++i)
         mNeighbours[i] = 0;
diff --git a/components/widgets/windowcaption.cpp b/components/widgets/windowcaption.cpp
index bcb0a7c125..1c8fb5608d 100644
--- a/components/widgets/windowcaption.cpp
+++ b/components/widgets/windowcaption.cpp
@@ -8,6 +8,7 @@ namespace Gui
     WindowCaption::WindowCaption()
         : mLeft(NULL)
         , mRight(NULL)
+        , mClient(NULL)
     {
     }