diff --git a/src/memline.c b/src/memline.c
index 4be1036..7d6cefa 100644
--- a/src/memline.c
+++ b/src/memline.c
@@ -4648,8 +4648,8 @@
  *		== 0   == 0	OK	FAIL	TRUE
  *
  * current file doesn't exist, inode for swap unknown, both file names not
- * available -> probably same file
- *		== 0   == 0    FAIL	FAIL	FALSE
+ * available -> compare file names
+ *		== 0   == 0    FAIL	FAIL	fname_c != fname_s
  *
  * Note that when the ino_t is 64 bits, only the last 32 will be used.  This
  * can't be changed without making the block 0 incompatible with 32 bit
@@ -4693,14 +4693,15 @@
     retval_c = vim_FullName(fname_c, buf_c, MAXPATHL, TRUE);
     retval_s = vim_FullName(fname_s, buf_s, MAXPATHL, TRUE);
     if (retval_c == OK && retval_s == OK)
-	return (STRCMP(buf_c, buf_s) != 0);
+	return STRCMP(buf_c, buf_s) != 0;
 
     /*
      * Can't compare inodes or file names, guess that the files are different,
-     * unless both appear not to exist at all.
+     * unless both appear not to exist at all, then compare with the file name
+     * in the swap file.
      */
     if (ino_s == 0 && ino_c == 0 && retval_c == FAIL && retval_s == FAIL)
-	return FALSE;
+	return STRCMP(fname_c, fname_s) != 0;
     return TRUE;
 }
 #endif /* CHECK_INODE */