diff --git a/gcc/gimple-fold.c b/gcc/gimple-fold.c
index 768ef89d876..6beb4f3d305 100644
--- a/gcc/gimple-fold.c
+++ b/gcc/gimple-fold.c
@@ -547,7 +547,8 @@ fold_gimple_assign (gimple_stmt_iterator *si)
 					   CONSTRUCTOR_ELTS (rhs));
 	  }
 
-	else if (DECL_P (rhs))
+	else if (DECL_P (rhs)
+		 && is_gimple_reg_type (TREE_TYPE (rhs)))
 	  return get_symbol_constant_value (rhs);
       }
       break;
diff --git a/gcc/testsuite/gcc.dg/pr100509.c b/gcc/testsuite/gcc.dg/pr100509.c
new file mode 100644
index 00000000000..9405e2a27df
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/pr100509.c
@@ -0,0 +1,9 @@
+/* { dg-do compile } */
+/* { dg-options "-O" } */
+
+struct X {
+  int a;
+};
+const int a = 0;
+static struct X A __attribute__((alias("a")));
+void foo() { struct X b = A; }