diff --git a/libpng16.spec b/libpng16.spec
index 80de3d6..bfe45c5 100644
--- a/libpng16.spec
+++ b/libpng16.spec
@@ -105,7 +105,7 @@ PNG files.
 export CFLAGS="%{optflags} -O3 -DPNG_SAFE_LIMITS_SUPPORTED -DPNG_SKIP_SETJMP_CHECK $(getconf LFS_CFLAGS)"
 export LDFLAGS="-Wl,-z,relro,-z,now"
 %if %{debug_build}
-export CFLAGS="$CFLAGS -O0"
+export CFLAGS="$CFLAGS -Og"
 %endif
 %configure \
               --disable-static