diff --git a/lib/Target/Sparc/FPMover.cpp b/lib/Target/Sparc/FPMover.cpp
index 5faf2a1..f72a4c4 100644
--- a/lib/Target/Sparc/FPMover.cpp
+++ b/lib/Target/Sparc/FPMover.cpp
@@ -33,7 +33,7 @@
     TargetMachine &TM;
     
     static char ID;
-    FPMover(TargetMachine &tm) 
+    explicit FPMover(TargetMachine &tm) 
       : MachineFunctionPass(&ID), TM(tm) { }
 
     virtual const char *getPassName() const {
diff --git a/lib/Transforms/IPO/ArgumentPromotion.cpp b/lib/Transforms/IPO/ArgumentPromotion.cpp
index 183e1a1..b562c42 100644
--- a/lib/Transforms/IPO/ArgumentPromotion.cpp
+++ b/lib/Transforms/IPO/ArgumentPromotion.cpp
@@ -66,8 +66,8 @@
 
     virtual bool runOnSCC(const std::vector<CallGraphNode *> &SCC);
     static char ID; // Pass identification, replacement for typeid
-    ArgPromotion(unsigned maxElements = 3) : CallGraphSCCPass(&ID),
-                                             maxElements(maxElements) {}
+    explicit ArgPromotion(unsigned maxElements = 3)
+      : CallGraphSCCPass(&ID), maxElements(maxElements) {}
 
     /// A vector used to hold the indices of a single GEP instruction
     typedef std::vector<uint64_t> IndicesVector;