diff --git a/nanovna.h b/nanovna.h
index 690609a..1719de3 100644
--- a/nanovna.h
+++ b/nanovna.h
@@ -897,7 +897,7 @@ typedef struct setting
   int attack;                     // KM_ATTACK  <   20000
 
   int32_t  slider_position;
-  uint32_t slider_span;
+  freq_t slider_span;
 
   uint32_t rbw_x10;
   uint32_t vbw_x10;
diff --git a/ui.c b/ui.c
index 9c027ac..d496e29 100644
--- a/ui.c
+++ b/ui.c
@@ -26,7 +26,7 @@
 #include <math.h>
 
 #pragma GCC push_options
-#pragma GCC optimize ("Og")
+#pragma GCC optimize ("Os")
 
 uistat_t uistat = {
  digit: 6,