diff --git a/src/ppc/interface-descriptors-ppc.cc b/src/ppc/interface-descriptors-ppc.cc
index 3ffe711780..20e395834c 100644
--- a/src/ppc/interface-descriptors-ppc.cc
+++ b/src/ppc/interface-descriptors-ppc.cc
@@ -99,6 +99,14 @@ void CallForwardVarargsDescriptor::InitializePlatformSpecific(
   data->InitializePlatformSpecific(arraysize(registers), registers);
 }
 
+void CallFunctionTemplateDescriptor::InitializePlatformSpecific(
+    CallInterfaceDescriptorData* data) {
+  // r4 : function template info
+  // r5 : number of arguments (on the stack, not including receiver)
+  Register registers[] = {r4, r5};
+  data->InitializePlatformSpecific(arraysize(registers), registers);
+}
+
 void CallWithSpreadDescriptor::InitializePlatformSpecific(
     CallInterfaceDescriptorData* data) {
   // r3 : number of arguments (on the stack, not including receiver)
diff --git a/src/s390/interface-descriptors-s390.cc b/src/s390/interface-descriptors-s390.cc
index ffb7eb55c0..da51d195ff 100644
--- a/src/s390/interface-descriptors-s390.cc
+++ b/src/s390/interface-descriptors-s390.cc
@@ -98,6 +98,14 @@ void CallForwardVarargsDescriptor::InitializePlatformSpecific(
   data->InitializePlatformSpecific(arraysize(registers), registers);
 }
 
+void CallFunctionTemplateDescriptor::InitializePlatformSpecific(
+    CallInterfaceDescriptorData* data) {
+  // r3 : function template info
+  // r4 : number of arguments (on the stack, not including receiver)
+  Register registers[] = {r3, r4};
+  data->InitializePlatformSpecific(arraysize(registers), registers);
+}
+
 void CallWithSpreadDescriptor::InitializePlatformSpecific(
     CallInterfaceDescriptorData* data) {
   // r2 : number of arguments (on the stack, not including receiver)