diff --git a/src/iperf_api.c b/src/iperf_api.c
index eb234030c..098976c87 100644
--- a/src/iperf_api.c
+++ b/src/iperf_api.c
@@ -1,5 +1,5 @@
 /*
- * iperf, Copyright (c) 2014-2022, The Regents of the University of
+ * iperf, Copyright (c) 2014-2023, The Regents of the University of
  * California, through Lawrence Berkeley National Laboratory (subject
  * to receipt of any required approvals from the U.S. Dept. of
  * Energy).  All rights reserved.
@@ -1135,7 +1135,7 @@ iperf_parse_arguments(struct iperf_test *test, int argc, char **argv)
     int flag;
     int portno;
     int blksize;
-    int server_flag, client_flag, rate_flag, duration_flag, rcv_timeout_flag, snd_timeout_flag;
+    int server_flag, client_flag, rate_flag, fq_rate_flag, duration_flag, rcv_timeout_flag, snd_timeout_flag;
     char *endptr;
 #if defined(HAVE_CPU_AFFINITY)
     char* comma;
@@ -1147,7 +1147,7 @@ iperf_parse_arguments(struct iperf_test *test, int argc, char **argv)
     int rcv_timeout_in = 0;
 
     blksize = 0;
-    server_flag = client_flag = rate_flag = duration_flag = rcv_timeout_flag = snd_timeout_flag =0;
+    server_flag = client_flag = rate_flag = fq_rate_flag = duration_flag = rcv_timeout_flag = snd_timeout_flag = 0;
 #if defined(HAVE_SSL)
     char *client_username = NULL, *client_rsa_public_key = NULL, *server_rsa_private_key = NULL;
     FILE *ptr_file;
@@ -1578,6 +1578,7 @@ iperf_parse_arguments(struct iperf_test *test, int argc, char **argv)
 	    case OPT_FQ_RATE:
 #if defined(HAVE_SO_MAX_PACING_RATE)
 		test->settings->fqrate = unit_atof_rate(optarg);
+                fq_rate_flag = 1;
 		client_flag = 1;
 #else /* HAVE_SO_MAX_PACING_RATE */
 		i_errno = IEUNIMP;
@@ -1720,6 +1721,12 @@ iperf_parse_arguments(struct iperf_test *test, int argc, char **argv)
         return -1;
     }
 
+    /* We can't do both --bandwidth and --fq-rate at the same time */
+    if (rate_flag && fq_rate_flag) {
+        i_errno = IERATEFQRATE;
+        return -1;
+    }
+
     if (blksize == 0) {
 	if (test->protocol->id == Pudp)
 	    blksize = 0;	/* try to dynamically determine from MSS */
diff --git a/src/iperf_api.h b/src/iperf_api.h
index 9e70d44f3..5c47c112a 100644
--- a/src/iperf_api.h
+++ b/src/iperf_api.h
@@ -418,6 +418,7 @@ enum {
     IESNDTIMEOUT = 33,      // Illegal message send timeout
     IEUDPFILETRANSFER = 34, // Cannot transfer file using UDP
     IESERVERAUTHUSERS = 35,   // Cannot access authorized users file
+    IERATEFQRATE = 36,      // Cannot specify both -b and --fq-rate
     /* Test errors */
     IENEWTEST = 100,        // Unable to create a new test (check perror)
     IEINITTEST = 101,       // Test initialization failed (check perror)
diff --git a/src/iperf_error.c b/src/iperf_error.c
index 6426554cf..72e1440e7 100644
--- a/src/iperf_error.c
+++ b/src/iperf_error.c
@@ -1,5 +1,5 @@
 /*
- * iperf, Copyright (c) 2014-2022, The Regents of the University of
+ * iperf, Copyright (c) 2014-2023, The Regents of the University of
  * California, through Lawrence Berkeley National Laboratory (subject
  * to receipt of any required approvals from the U.S. Dept. of
  * Energy).  All rights reserved.
@@ -198,6 +198,9 @@ iperf_strerror(int int_errno)
         case IESERVERAUTHUSERS:
              snprintf(errstr, len, "cannot access authorized users file");
             break;
+        case IERATEFQRATE:
+             snprintf(errstr, len, "-b and --fq-rate cannot be specified together");
+            break;
 	case IEBADFORMAT:
 	    snprintf(errstr, len, "bad format specifier (valid formats are in the set [kmgtKMGT])");
 	    break;