diff --git a/graf2d/graf/src/TGaxis.cxx b/graf2d/graf/src/TGaxis.cxx
index 3d6a3de2b06968236bce37d03cdc38893e365dbc..1ec67524a195b8faec1e1eee98d5d9b1fb8865f6 100644
--- a/graf2d/graf/src/TGaxis.cxx
+++ b/graf2d/graf/src/TGaxis.cxx
@@ -1491,13 +1491,13 @@ L110:
 
                   if (label[first] == '.') { //check if '.' is preceeded by a digit
                      strncpy(chtemp, "0",256);
-                     strcat(chtemp, &label[first]);
+                     strlcat(chtemp, &label[first],256);
                      strncpy(label, chtemp,256);
                      first = 1; last = strlen(label);
                   }
                   if (label[first] == '-' && label[first+1] == '.') {
                      strncpy(chtemp, "-0",256);
-                     strcat(chtemp, &label[first+1]);
+                     strlcat(chtemp, &label[first+1],256);
                      strncpy(label, chtemp, 256);
                      first = 1; last = strlen(label);
                   }