diff --git a/llvm/lib/MC/WasmObjectWriter.cpp b/llvm/lib/MC/WasmObjectWriter.cpp
index 39b49b0..0f8a42a 100644
--- a/llvm/lib/MC/WasmObjectWriter.cpp
+++ b/llvm/lib/MC/WasmObjectWriter.cpp
@@ -216,7 +216,7 @@
   std::vector<WasmCustomSection> CustomSections;
   unsigned NumFunctionImports = 0;
   unsigned NumGlobalImports = 0;
-  uint32_t SectionCount;
+  uint32_t SectionCount = 0;
 
   // TargetObjectWriter wrappers.
   bool is64Bit() const { return TargetObjectWriter->is64Bit(); }