diff --git a/ais_charset.c b/ais_charset.c
index a487e3cc7..44cb0c2a2 100644
--- a/ais_charset.c
+++ b/ais_charset.c
@@ -1,3 +1,3 @@
 #include "ais_charset.h"
 
-char ais_charset[64] = "@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_ !\"#$%&'()*+,-./0123456789:;<=>?";
+char ais_charset[64] __attribute__ ((nonstring)) = "@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_ !\"#$%&'()*+,-./0123456789:;<=>?";
diff --git a/interactive.c b/interactive.c
index 8761c955d..c093ba208 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] __attribute__ ((nonstring)) = "|/-\\";
     int valid = 0;
     double signalMax = -100.0;
     double signalMin = +100.0;