diff --git a/eprecomp.h b/eprecomp.h
index b4fd6059..1f325676 100644
--- a/eprecomp.h
+++ b/eprecomp.h
@@ -43,6 +43,8 @@ class DL_FixedBasePrecomputationImpl : public DL_FixedBasePrecomputation<T>
 public:
 	typedef T Element;
 
+	DL_FixedBasePrecomputationImpl() : m_windowSize(0) {}
+
 	// DL_FixedBasePrecomputation
 	bool IsInitialized() const
 		{return !m_bases.empty();}
diff --git a/zdeflate.cpp b/zdeflate.cpp
index b08f357a..bef0f7c1 100644
--- a/zdeflate.cpp
+++ b/zdeflate.cpp
@@ -214,6 +214,7 @@ inline void HuffmanEncoder::Encode(LowFirstBitWriter &writer, value_t value) con
 
 Deflator::Deflator(BufferedTransformation *attachment, int deflateLevel, int log2WindowSize, bool detectUncompressible)
 	: LowFirstBitWriter(attachment)
+	, m_deflateLevel(-1)
 {
 	InitializeStaticEncoders();
 	IsolatedInitialize(MakeParameters("DeflateLevel", deflateLevel)("Log2WindowSize", log2WindowSize)("DetectUncompressible", detectUncompressible));