diff --git a/AST/Decl.cpp b/AST/Decl.cpp
index 16233b1..cebd295 100644
--- a/AST/Decl.cpp
+++ b/AST/Decl.cpp
@@ -242,8 +242,8 @@
 }
 
 unsigned FunctionDecl::getNumParams() const {
-  if (isa<FunctionTypeNoProto>(getType())) return 0;
-  return cast<FunctionTypeProto>(getType())->getNumArgs();
+  if (isa<FunctionTypeNoProto>(getCanonicalType())) return 0;
+  return cast<FunctionTypeProto>(getCanonicalType())->getNumArgs();
 }
 
 void FunctionDecl::setParams(ParmVarDecl **NewParamInfo, unsigned NumParams) {
diff --git a/test/Sema/ast-print.c b/test/Sema/ast-print.c
index 97ee84f..34b0411 100644
--- a/test/Sema/ast-print.c
+++ b/test/Sema/ast-print.c
@@ -3,4 +3,6 @@
 typedef void func_typedef();
 func_typedef xxx;
 
+typedef void func_t(int x);
+func_t a;