diff --git a/libdevcore/Whiskers.h b/libdevcore/Whiskers.h
index ebe17b51c..5d326bf02 100644
--- a/libdevcore/Whiskers.h
+++ b/libdevcore/Whiskers.h
@@ -85,6 +85,8 @@ public:
 	std::string render() const;
 
 private:
+	// Prevent implicit cast to bool
+	Whiskers& operator()(std::string _parameter, long long);
 	void checkParameterValid(std::string const& _parameter) const;
 	void checkParameterUnknown(std::string const& _parameter) const;
 
diff --git a/libsolidity/codegen/YulUtilFunctions.cpp b/libsolidity/codegen/YulUtilFunctions.cpp
index 13e410a74..c8b2e2d03 100644
--- a/libsolidity/codegen/YulUtilFunctions.cpp
+++ b/libsolidity/codegen/YulUtilFunctions.cpp
@@ -655,7 +655,7 @@ string YulUtilFunctions::arrayConvertLengthToSize(ArrayType const& _type)
 						</byteArray>
 					})")
 					("functionName", functionName)
-					("elementSize", _type.location() == DataLocation::Memory ? baseType.memoryHeadSize() : baseType.calldataEncodedSize())
+					("elementSize", to_string(_type.location() == DataLocation::Memory ? baseType.memoryHeadSize() : baseType.calldataEncodedSize()))
 					("byteArray", _type.isByteArray())
 					("mul", overflowCheckedIntMulFunction(*TypeProvider::uint256()))
 					.render();