diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 86527011cea7..d2528d1645b7 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2015-03-19  Jan Hubicka  <hubicka@ucw.cz>
+
+	PR ipa/65380
+	* ipa-icf.c (sem_function::merge): Do not merge DECL_EXTERNAL symbols.
+	(sem_variable::merge): Likewise.
+
 2015-03-19  Martin Liska  <mliska@suse.cz>
 
 	PR ipa/65465
diff --git a/gcc/ipa-icf.c b/gcc/ipa-icf.c
index f68d23cf4dc6..360cf17199cb 100644
--- a/gcc/ipa-icf.c
+++ b/gcc/ipa-icf.c
@@ -814,6 +814,13 @@ sem_function::merge (sem_item *alias_item)
   bool original_address_matters = original->address_matters_p ();
   bool alias_address_matters = alias->address_matters_p ();
 
+  if (DECL_EXTERNAL (alias->decl))
+    {
+      if (dump_file)
+	fprintf (dump_file, "Not unifying; alias is external.\n\n");
+      return false;
+    }
+
   if (DECL_NO_INLINE_WARNING_P (original->decl)
       != DECL_NO_INLINE_WARNING_P (alias->decl))
     {
@@ -1776,6 +1783,13 @@ sem_variable::merge (sem_item *alias_item)
       return false;
     }
 
+  if (DECL_EXTERNAL (alias_item->decl))
+    {
+      if (dump_file)
+	fprintf (dump_file, "Not unifying; alias is external.\n\n");
+      return false;
+    }
+
   sem_variable *alias_var = static_cast<sem_variable *> (alias_item);
 
   varpool_node *original = get_node ();