diff --git a/src/help.c b/src/help.c
index 77b2205..a36b671 100644
--- a/src/help.c
+++ b/src/help.c
@@ -818,32 +818,31 @@
 			// the same directory.
 			for (i1 = 0; i1 < fcount; ++i1)
 			{
-			    for (i2 = 0; i2 < fcount; ++i2)
+			    f1 = fnames[i1];
+			    t1 = gettail(f1);
+			    e1 = vim_strrchr(t1, '.');
+			    if (fnamecmp(e1, ".txt") != 0
+					       && fnamecmp(e1, fname + 4) != 0)
 			    {
-				if (i1 == i2)
-				    continue;
-				if (fnames[i1] == NULL || fnames[i2] == NULL)
-				    continue;
-				f1 = fnames[i1];
+				// Not .txt and not .abx, remove it.
+				VIM_CLEAR(fnames[i1]);
+				continue;
+			    }
+
+			    for (i2 = i1 + 1; i2 < fcount; ++i2)
+			    {
 				f2 = fnames[i2];
-				t1 = gettail(f1);
+				if (f2 == NULL)
+				    continue;
 				t2 = gettail(f2);
-				e1 = vim_strrchr(t1, '.');
 				e2 = vim_strrchr(t2, '.');
 				if (e1 == NULL || e2 == NULL)
 				    continue;
-				if (fnamecmp(e1, ".txt") != 0
-				    && fnamecmp(e1, fname + 4) != 0)
-				{
-				    // Not .txt and not .abx, remove it.
-				    VIM_CLEAR(fnames[i1]);
-				    continue;
-				}
 				if (e1 - f1 != e2 - f2
 					    || fnamencmp(f1, f2, e1 - f1) != 0)
 				    continue;
 				if (fnamecmp(e1, ".txt") == 0
-				    && fnamecmp(e2, fname + 4) == 0)
+					       && fnamecmp(e2, fname + 4) == 0)
 				    // use .abx instead of .txt
 				    VIM_CLEAR(fnames[i1]);
 			    }