--- a/test/test_tfits.c
+++ b/test/test_tfits.c
@@ -322,7 +322,7 @@
      *    Test on BINARY tables
      */
     say("Test the BINARY table") ;
-    strcat(filename, srcdir) ;
+    strcpy(filename, srcdir) ;
     strcat(filename, BIN_TABLE_NAME) ;
     err += qfits_test_table(filename, 1) ;