diff --git a/nanovna.h b/nanovna.h
index 2b78a8f..926057a 100644
--- a/nanovna.h
+++ b/nanovna.h
@@ -1250,9 +1250,9 @@ typedef struct ui_button {
   union {
     int32_t  i;
     uint32_t u;
-    float f;
+    float    f;
     const char *text;
-  } param_1, param_2;    // void data for label printf
+  } param_1;    // void data for label printf
   char text[32];
 } ui_button_t;