diff --git a/src/northbridge/intel/gm45/gm45.h b/src/northbridge/intel/gm45/gm45.h
index 5373e5e..086afd5 100644
--- a/src/northbridge/intel/gm45/gm45.h
+++ b/src/northbridge/intel/gm45/gm45.h
@@ -442,6 +442,7 @@
 	int pwm_freq; /* In Hz */
 };
 int get_blc_values(const struct blc_pwm_t **entries);
+u16 get_blc_pwm_freq_value(const char *edid_ascii_string);
 
 
 #if ENV_RAMSTAGE && !defined(__SIMPLE_DEVICE__)