diff --git a/src/core/command.cpp b/src/core/command.cpp
index 4352da48f..0923db2e8 100644
--- a/src/core/command.cpp
+++ b/src/core/command.cpp
@@ -220,7 +220,7 @@ const char * Command::return_code_string(const uint8_t return_code) {
     default:
         break;
     }
-    char s[4];
+    static char s[4];
     return Helpers::smallitoa(s, return_code);
 }