diff --git a/gcc/cp/ChangeLog b/gcc/cp/ChangeLog
index ca317e7730b..1d30cef717e 100644
--- a/gcc/cp/ChangeLog
+++ b/gcc/cp/ChangeLog
@@ -1,3 +1,8 @@
+2019-09-25  Marek Polacek  <polacek@redhat.com>
+
+	PR c++/91877 - ICE with converting member of packed struct.
+	* call.c (convert_like_real): Use similar_type_p in an assert.
+
 2019-09-25  Paolo Carlini  <paolo.carlini@oracle.com>
 
 	* name-lookup.c (check_extern_c_conflict): Use DECL_SOURCE_LOCATION.
diff --git a/gcc/cp/call.c b/gcc/cp/call.c
index 77f10a9f5f1..45b984ecb11 100644
--- a/gcc/cp/call.c
+++ b/gcc/cp/call.c
@@ -7382,8 +7382,7 @@ convert_like_real (conversion *convs, tree expr, tree fn, int argnum,
 	    tree type = TREE_TYPE (ref_type);
 	    cp_lvalue_kind lvalue = lvalue_kind (expr);
 
-	    gcc_assert (same_type_ignoring_top_level_qualifiers_p
-			(type, next_conversion (convs)->type));
+	    gcc_assert (similar_type_p (type, next_conversion (convs)->type));
 	    if (!CP_TYPE_CONST_NON_VOLATILE_P (type)
 		&& !TYPE_REF_IS_RVALUE (ref_type))
 	      {
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index bf03a5e3c9e..8830baa3aba 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2019-09-25  Marek Polacek  <polacek@redhat.com>
+
+	PR c++/91877 - ICE with converting member of packed struct.
+	* g++.dg/conversion/packed1.C: New test.
+
 2019-09-25  Richard Biener  <rguenther@suse.de>
 
 	PR tree-optimization/91896
diff --git a/gcc/testsuite/g++.dg/conversion/packed1.C b/gcc/testsuite/g++.dg/conversion/packed1.C
new file mode 100644
index 00000000000..c4be930bc19
--- /dev/null
+++ b/gcc/testsuite/g++.dg/conversion/packed1.C
@@ -0,0 +1,12 @@
+// PR c++/91877 - ICE with converting member of packed struct.
+// { dg-do compile { target c++11 } }
+// { dg-options "-fpack-struct" }
+
+template <typename a> class b {
+public:
+  b(const a &);
+};
+struct {
+  int *c;
+} d;
+void e() { b<const int *>(d.c); }