diff --git a/core/org.eclipse.cdt.core.tests/parser/org/eclipse/cdt/core/parser/tests/ast2/AST2TemplateTests.java b/core/org.eclipse.cdt.core.tests/parser/org/eclipse/cdt/core/parser/tests/ast2/AST2TemplateTests.java
index 00e661556e4..a8a937771f0 100644
--- a/core/org.eclipse.cdt.core.tests/parser/org/eclipse/cdt/core/parser/tests/ast2/AST2TemplateTests.java
+++ b/core/org.eclipse.cdt.core.tests/parser/org/eclipse/cdt/core/parser/tests/ast2/AST2TemplateTests.java
@@ -8164,4 +8164,20 @@ public class AST2TemplateTests extends AST2TestBase {
 	public void testSpecializedEnumerator_418770() throws Exception {
 		parseAndCheckBindings();
 	}
+
+	//	template <typename T>
+	//	class A;
+	//
+	//	namespace ns {
+	//	    template <typename T>
+	//	    int waldo(const A<T>&);
+	//	}
+	//
+	//	template <typename T>
+	//	class A {
+	//	    friend int ns::waldo<T>(const A<T>&);
+	//	};
+	public void testDependentSpecializationOfFunctionTemplateAsFriend_422505() throws Exception {
+		parseAndCheckBindings();
+	}
 }
diff --git a/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/cpp/semantics/CPPSemantics.java b/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/cpp/semantics/CPPSemantics.java
index f2343632b29..ecd3b3dbc9d 100644
--- a/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/cpp/semantics/CPPSemantics.java
+++ b/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/cpp/semantics/CPPSemantics.java
@@ -2648,6 +2648,12 @@ public class CPPSemantics {
 		for (ICPPFunction fn : fns) {
 			if (fn instanceof ICPPFunctionTemplate
 					&& !(fn instanceof IProblemBinding) && !(fn instanceof ICPPUnknownBinding)) {
+				// If the declared function type is dependent, there is no point trying to use it
+				// to instantiate the template, so return a deferred function instead.
+				// Note that CPPTemplates.instantiateForFunctionCall() behaves similarly.
+				if (CPPTemplates.isDependentType(ft)) {
+					return CPPDeferredFunction.createForCandidates(fns);
+				}
 				ICPPFunctionTemplate template= (ICPPFunctionTemplate) fn;
 				ICPPFunction inst= CPPTemplates.instantiateForFunctionDeclaration(template, tmplArgs, ft, data.getLookupPoint());
 				if (inst != null) {