diff --git a/config.c b/config.c
index d539a5b..08508be 100644
--- a/config.c
+++ b/config.c
@@ -94,6 +94,7 @@ struct config_item config_tab[] = {
 	GLOB_ITEM_INT("assume_two_step", 0, 0, 1),
 	GLOB_ITEM_INT("check_fup_sync", 0, 0, 1),
 	GLOB_ITEM_DBL("first_step_threshold", 0.00002, 0.0, DBL_MAX),
+	GLOB_ITEM_INT("max_frequency", 900000000, 0, INT_MAX),
 	GLOB_ITEM_DBL("step_threshold", 0.0, 0.0, DBL_MAX),
 	GLOB_ITEM_INT("tx_timestamp_timeout", 1, 1, INT_MAX),
 	PORT_ITEM_INT("udp_ttl", 1, 1, 255),
@@ -585,12 +586,6 @@ static enum parser_result parse_global_setting(const char *option,
 			return r;
 		*cfg->pi_integral_norm_max = df;
 
-	} else if (!strcmp(option, "max_frequency")) {
-		r = get_ranged_int(value, &val, 0, INT_MAX);
-		if (r != PARSED_OK)
-			return r;
-		*cfg->max_frequency = val;
-
 	} else if (!strcmp(option, "sanity_freq_limit")) {
 		r = get_ranged_int(value, &val, 0, INT_MAX);
 		if (r != PARSED_OK)
diff --git a/config.h b/config.h
index b8781fa..a297e85 100644
--- a/config.h
+++ b/config.h
@@ -72,8 +72,6 @@ struct config {
 	struct port_defaults pod;
 	enum servo_type clock_servo;
 
-	int *max_frequency;
-
 	double *pi_proportional_const;
 	double *pi_integral_const;
 	double *pi_proportional_scale;
diff --git a/ptp4l.c b/ptp4l.c
index 575ee0c..ca62370 100644
--- a/ptp4l.c
+++ b/ptp4l.c
@@ -103,8 +103,6 @@ static struct config cfg_settings = {
 	.transport = TRANS_UDP_IPV4,
 	.clock_servo = CLOCK_SERVO_PI,
 
-	.max_frequency = &servo_max_frequency,
-
 	.pi_proportional_const = &configured_pi_kp,
 	.pi_integral_const = &configured_pi_ki,
 	.pi_proportional_scale = &configured_pi_kp_scale,
diff --git a/servo.c b/servo.c
index 4f26ea6..2e82ebe 100644
--- a/servo.c
+++ b/servo.c
@@ -27,13 +27,12 @@
 
 #define NSEC_PER_SEC 1000000000
 
-int servo_max_frequency = 900000000;
-
 struct servo *servo_create(struct config *cfg, enum servo_type type,
 			   int fadj, int max_ppb, int sw_ts)
 {
 	double servo_first_step_threshold;
 	double servo_step_threshold;
+	int servo_max_frequency;
 	struct servo *servo;
 
 	switch (type) {
@@ -70,6 +69,7 @@ struct servo *servo_create(struct config *cfg, enum servo_type type,
 		servo->first_step_threshold = 0.0;
 	}
 
+	servo_max_frequency = config_get_int(cfg, NULL, "max_frequency");
 	servo->max_frequency = max_ppb;
 	if (servo_max_frequency && servo->max_frequency > servo_max_frequency) {
 		servo->max_frequency = servo_max_frequency;
diff --git a/servo.h b/servo.h
index b5252df..f90befd 100644
--- a/servo.h
+++ b/servo.h
@@ -24,12 +24,6 @@
 
 struct config;
 
-/**
- * When set to a non-zero value, this variable sets an additional limit for
- * the frequency adjustment of the clock. It's in ppb.
- */
-extern int servo_max_frequency;
-
 /** Opaque type */
 struct servo;