diff --git a/include/isam.cpp b/include/isam.cpp
index 40ce2a72b..e0d51b0c7 100755
--- a/include/isam.cpp
+++ b/include/isam.cpp
@@ -2870,7 +2870,7 @@ void TRectype::put(const char* fieldname, char val)
 void TRectype::put(const char* fieldname, bool val)
 
 {
-  char* s = val ? "T" : "F";
+  char s[2] = { val ? 'T' : 'F', '\0'};
   if (CPutFieldBuff((char*) fieldname, rec_des(), s, _rec) == FIELDERR)
     UNKNOWN_FIELD(num(), fieldname);
   setempty(FALSE);