1 files changed, 2 insertions, 0 deletions
diff --git a/complex.c b/complex.c
index 6b14ae6907..b65bc8a61c 100644
--- a/complex.c
+++ b/complex.c
@@ -2209,6 +2209,8 @@ Init_Complex(void)
      */
     rb_define_const(rb_cComplex, "I",
 		    f_complex_new_bang2(rb_cComplex, ZERO, ONE));
+
+    rb_provide("complex.so");	/* for backward compatibility */
 }
 
 /*