diff --git a/main.c b/main.c
index a88586c..57cba65 100644
--- a/main.c
+++ b/main.c
@@ -2150,7 +2150,9 @@ static const VNAShellCommand commands[] =
     {"time"        , cmd_time        , CMD_RUN_IN_LOAD},
 #endif
     {"dac"         , cmd_dac         , CMD_RUN_IN_LOAD},
+#ifdef __SWEEP_OUTPUT__
     {"sweep_voltage",cmd_sweep_voltage,CMD_RUN_IN_LOAD},
+#endif
 #ifdef __NOISE_FIGURE__
     {"nf",          cmd_nf,            CMD_RUN_IN_LOAD},
 #endif
diff --git a/sa_cmd.c b/sa_cmd.c
index f9d9232..3d726cf 100644
--- a/sa_cmd.c
+++ b/sa_cmd.c
@@ -510,6 +510,7 @@ VNA_SHELL_FUNCTION(cmd_deviceid)
   }
 }
 
+#ifdef __SWEEP_OUTPUT__
 VNA_SHELL_FUNCTION(cmd_sweep_voltage)
 {
   float value;
@@ -521,6 +522,7 @@ VNA_SHELL_FUNCTION(cmd_sweep_voltage)
   value = my_atof(argv[0]);
   config.sweep_voltage = value;
 }
+#endif
 
 #ifdef __NOISE_FIGURE__
 VNA_SHELL_FUNCTION(cmd_nf)