diff --git a/clang/lib/Sema/SemaDeclCXX.cpp b/clang/lib/Sema/SemaDeclCXX.cpp
index 1c5415900b9f..f2dfe3615f54 100644
--- a/clang/lib/Sema/SemaDeclCXX.cpp
+++ b/clang/lib/Sema/SemaDeclCXX.cpp
@@ -3694,7 +3694,7 @@ Sema::CheckReferenceInit(Expr *&Init, QualType DeclType,
     if (badConversion) {
       if ((Conversions.ConversionKind  == 
             ImplicitConversionSequence::BadConversion)
-          && Conversions.ConversionFunctionSet.size() > 0) {
+          && !Conversions.ConversionFunctionSet.empty()) {
         Diag(DeclLoc, 
              diag::err_lvalue_to_rvalue_ambig_ref) << Init->getSourceRange();
         for (int j = Conversions.ConversionFunctionSet.size()-1; 
diff --git a/clang/lib/Sema/SemaOverload.cpp b/clang/lib/Sema/SemaOverload.cpp
index 885f59c5aacf..42f3511e5798 100644
--- a/clang/lib/Sema/SemaOverload.cpp
+++ b/clang/lib/Sema/SemaOverload.cpp
@@ -2241,7 +2241,7 @@ Sema::AddOverloadCandidate(FunctionDecl *Function,
       // ranking implicit conversion sequences as described in 13.3.3.2, the ambiguous 
       // conversion sequence is treated as a user-defined sequence that is 
       // indistinguishable from any other user-defined conversion sequence
-        if (Candidate.Conversions[ArgIdx].ConversionFunctionSet.size() > 0)
+        if (!Candidate.Conversions[ArgIdx].ConversionFunctionSet.empty())
           Candidate.Conversions[ArgIdx].ConversionKind =
             ImplicitConversionSequence::UserDefinedConversion;
         else {