diff --git a/configure.ac b/configure.ac
index 7e8578ab48c4ead2687cb6a453a3c51295afefbd..35d05ac4ac8a7a6e741f8ee73d09ee5d8710abc3 100644
--- a/configure.ac
+++ b/configure.ac
@@ -150,7 +150,7 @@ if test "$bird_cflags_default" = yes ; then
 
   if test "$bird_cv_c_lto" = yes; then
     CFLAGS="$CFLAGS -flto"
-    LDFLAGS="$LDFLAGS -flto=4"
+    LDFLAGS="$LDFLAGS -flto=4 -g"
   fi
 
   CFLAGS="$CFLAGS -Wall -Wextra -Wstrict-prototypes -Wno-parentheses"