1 files changed, 1 insertions, 1 deletions
diff --git a/include/llvm/MC/MCContext.h b/include/llvm/MC/MCContext.h
index c4f009ff05..b62fefaace 100644
--- a/include/llvm/MC/MCContext.h
+++ b/include/llvm/MC/MCContext.h
@@ -48,7 +48,7 @@ namespace llvm {
     /// objects.
     BumpPtrAllocator Allocator;
   public:
-    MCContext(const MCAsmInfo &MAI);
+    explicit MCContext(const MCAsmInfo &MAI);
     ~MCContext();
     
     const MCAsmInfo &getAsmInfo() const { return MAI; }