diff --git a/ais_charset.c b/ais_charset.c
index a487e3cc7..72deaa96b 100644
--- a/ais_charset.c
+++ b/ais_charset.c
@@ -1,3 +1,9 @@
 #include "ais_charset.h"
 
-char ais_charset[64] = "@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_ !\"#$%&'()*+,-./0123456789:;<=>?";
+char ais_charset[64] = {
+    '@','A','B','C','D','E','F','G','H','I','J','K','L','M','N','O',
+    'P','Q','R','S','T','U','V','W','X','Y','Z','[','\\',']','^','_',
+    ' ','!','"','#','$','%','&','\'','(',')','*','+',
+    ',', '-', '.', '/', '0','1','2','3','4','5','6','7','8','9',
+    ':',';','<','=','>','?'
+};
diff --git a/interactive.c b/interactive.c
index 8761c955d..f56146d52 100644
--- a/interactive.c
+++ b/interactive.c
@@ -140,7 +140,7 @@ void interactiveShowData(void) {
     static bool need_clear = true;
     uint64_t now = mstime();
     char progress;
-    char spinner[4] = "|/-\\";
+    char spinner[4] = { '|', '/', '-', '\\' };
     int valid = 0;
     double signalMax = -100.0;
     double signalMin = +100.0;