--- a/src/runtime/Config.x86-win32
+++ b/src/runtime/Config.x86-win32
@@ -1,3 +1,5 @@
+# -*- makefile -*- for the C-level run-time support for SBCL
+
 # This software is part of the SBCL system. See the README file for
 # more information.
 #
@@ -30,7 +32,7 @@
 
 GC_SRC = gencgc.c
 
-CFLAGS =  -g -Wall -O3
+CFLAGS = -g -Wall -O3 -fno-omit-frame-pointer
 ASFLAGS = $(CFLAGS)
 
 CPP = cpp