diff --git a/flash.c b/flash.c
index 29c916b..1731f16 100644
--- a/flash.c
+++ b/flash.c
@@ -162,7 +162,7 @@ caldata_save(int id)
   }
 
   /* after saving data, make active configuration points to flash */
-  active = (properties_t*)saveareas[id];
+  active_props = (properties_t*)saveareas[id];
   lastsaveid = id;
 
   return 0;
@@ -186,7 +186,7 @@ caldata_recall(int id)
     return -1;
 
   /* active configuration points to save data on flash memory */
-  active = src;
+  active_props = src;
   lastsaveid = id;
 
   /* duplicated saved data onto sram to be able to modify marker/trace */
diff --git a/main.c b/main.c
index c4e5728..3dd7e35 100644
--- a/main.c
+++ b/main.c
@@ -331,7 +331,7 @@ config_t config = {
 properties_t current_props = {
   /* magic */   CONFIG_MAGIC,
   /* frequency0 */   1000000,
-  /* frequency1 */  300000000,
+  /* frequency1 */ 300000000,
   /* sweep_points */     101,
   /* cal_status */         0,
   /* frequencies */       {},
@@ -340,8 +340,8 @@ properties_t current_props = {
   {/*enable, type, channel, polar, scale*/
     { 1, TRC_LOGMAG, 0, 0, 1.0, 7.0 },
     { 1, TRC_LOGMAG, 1, 0, 1.0, 7.0 },
-    { 1, TRC_SMITH, 0, 1, 1.0, 0.0 },
-    { 1, TRC_PHASE, 1, 0, 1.0, 4.0 }
+    { 1, TRC_SMITH,  0, 1, 1.0, 0.0 },
+    { 1, TRC_PHASE,  1, 0, 1.0, 4.0 }
   },
   /* markers[4] */ {
   { 1, 30 }, { 0, 40 }, { 0, 60 }, { 0, 80 }
@@ -349,16 +349,16 @@ properties_t current_props = {
   /* active_marker */      0,
   /* checksum */           0
 };
-properties_t *active = &current_props;
+properties_t *active_props = &current_props;
 
 void
 ensure_edit_config(void)
 {
-  if (active == &current_props)
+  if (active_props == &current_props)
     return;
 
-  //memcpy(&current_props, active, sizeof(config_t));
-  active = &current_props;
+  //memcpy(&current_props, active_props, sizeof(config_t));
+  active_props = &current_props;
   // move to uncal state
   cal_status = 0;
 }
diff --git a/nanovna.h b/nanovna.h
index e9d6917..e23372a 100644
--- a/nanovna.h
+++ b/nanovna.h
@@ -266,7 +266,7 @@ typedef struct {
 #define CONFIG_MAGIC 0x436f4e45 /* 'CoNF' */
 
 extern int16_t lastsaveid;
-extern properties_t *active;
+extern properties_t *active_props;
 extern properties_t current_props;
 
 #define frequency0 current_props._frequency0
@@ -274,7 +274,7 @@ extern properties_t current_props;
 #define sweep_points current_props._sweep_points
 #define cal_status current_props._cal_status
 #define frequencies current_props._frequencies
-#define cal_data active->_cal_data
+#define cal_data active_props->_cal_data
 
 #define trace current_props._trace
 #define markers current_props._markers
diff --git a/plot.c b/plot.c
index bedcd52..a941701 100644
--- a/plot.c
+++ b/plot.c
@@ -1322,7 +1322,7 @@ draw_cal_status(void)
   ili9341_fill(0, y, 10, 6*YSTEP, 0x0000);
   if (cal_status & CALSTAT_APPLY) {
     char c[3] = "C0";
-    if (active == &current_props)
+    if (active_props == &current_props)
       c[1] = '*';
     else
       c[1] += lastsaveid;