diff --git a/src/Pass.cpp b/src/Pass.cpp
index 46c0588..6a6f85b 100644
--- a/src/Pass.cpp
+++ b/src/Pass.cpp
@@ -163,14 +163,14 @@ template <typename AnalysisPassType> void registerAnalysisPass() {
 }
 
 template <typename OptimizationPassType, typename std::enable_if<
-    std::is_constructible<OptimizationPassType, IRBuilder*>::value, int>::type = 0>
+    std::is_constructible<OptimizationPassType, IRBuilder*>::value, int>::type>
 void registerOptimizationPass(IRBuilder* builder) {
     PassRegistry::getPassRegistry().registerPass(&OptimizationPassType::ID,
                                                  [builder]() { return std::make_unique<OptimizationPassType>(builder); });
 }
 
 template <typename OptimizationPassType, typename std::enable_if<
-    !std::is_constructible<OptimizationPassType, IRBuilder*>::value, int>::type = 0>
+    !std::is_constructible<OptimizationPassType, IRBuilder*>::value, int>::type>
 void registerOptimizationPass() {
     PassRegistry::getPassRegistry().registerPass(&OptimizationPassType::ID,
                                                  []() { return std::make_unique<OptimizationPassType>(); });