diff --git a/builtin/blame.c b/builtin/blame.c
index c2da673ac8..97632828db 100644
--- a/builtin/blame.c
+++ b/builtin/blame.c
@@ -1001,7 +1001,7 @@ parse_done:
 		long bottom, top;
 		if (parse_range_arg(range_list.items[range_i].string,
 				    nth_line_cb, &sb, lno, anchor,
-				    &bottom, &top, sb.path))
+				    &bottom, &top, sb.path, &the_index))
 			usage(blame_usage);
 		if ((!lno && (top || bottom)) || lno < bottom)
 			die(Q_("file %s has only %lu line",
diff --git a/line-log.c b/line-log.c
index 35adf199a5..d1d429d738 100644
--- a/line-log.c
+++ b/line-log.c
@@ -574,7 +574,7 @@ parse_lines(struct repository *r, struct commit *commit,
 		long begin = 0, end = 0;
 		long anchor;
 
-		name_part = skip_range_arg(item->string);
+		name_part = skip_range_arg(item->string, r->index);
 		if (!name_part || *name_part != ':' || !name_part[1])
 			die("-L argument not 'start,end:file' or ':funcname:file': %s",
 			    item->string);
@@ -599,7 +599,7 @@ parse_lines(struct repository *r, struct commit *commit,
 
 		if (parse_range_arg(range_part, nth_line, &cb_data,
 				    lines, anchor, &begin, &end,
-				    full_name))
+				    full_name, r->index))
 			die("malformed -L argument '%s'", range_part);
 		if ((!lines && (begin || end)) || lines < begin)
 			die("file %s has only %lu lines", name_part, lines);
diff --git a/line-range.c b/line-range.c
index 7fa0d8bba5..9b50583dc0 100644
--- a/line-range.c
+++ b/line-range.c
@@ -163,9 +163,10 @@ static const char *find_funcname_matching_regexp(xdemitconf_t *xecfg, const char
 	}
 }
 
-static const char *parse_range_funcname(const char *arg, nth_line_fn_t nth_line_cb,
-					void *cb_data, long lines, long anchor, long *begin, long *end,
-					const char *path)
+static const char *parse_range_funcname(
+	const char *arg, nth_line_fn_t nth_line_cb,
+	void *cb_data, long lines, long anchor, long *begin, long *end,
+	const char *path, struct index_state *istate)
 {
 	char *pattern;
 	const char *term;
@@ -198,7 +199,7 @@ static const char *parse_range_funcname(const char *arg, nth_line_fn_t nth_line_
 	anchor--; /* input is in human terms */
 	start = nth_line_cb(cb_data, anchor);
 
-	drv = userdiff_find_by_path(&the_index, path);
+	drv = userdiff_find_by_path(istate, path);
 	if (drv && drv->funcname.pattern) {
 		const struct userdiff_funcname *pe = &drv->funcname;
 		xecfg = xcalloc(1, sizeof(*xecfg));
@@ -244,7 +245,8 @@ static const char *parse_range_funcname(const char *arg, nth_line_fn_t nth_line_
 
 int parse_range_arg(const char *arg, nth_line_fn_t nth_line_cb,
 		    void *cb_data, long lines, long anchor,
-		    long *begin, long *end, const char *path)
+		    long *begin, long *end,
+		    const char *path, struct index_state *istate)
 {
 	*begin = *end = 0;
 
@@ -254,7 +256,9 @@ int parse_range_arg(const char *arg, nth_line_fn_t nth_line_cb,
 		anchor = lines + 1;
 
 	if (*arg == ':' || (*arg == '^' && *(arg + 1) == ':')) {
-		arg = parse_range_funcname(arg, nth_line_cb, cb_data, lines, anchor, begin, end, path);
+		arg = parse_range_funcname(arg, nth_line_cb, cb_data,
+					   lines, anchor, begin, end,
+					   path, istate);
 		if (!arg || *arg)
 			return -1;
 		return 0;
@@ -275,10 +279,12 @@ int parse_range_arg(const char *arg, nth_line_fn_t nth_line_cb,
 	return 0;
 }
 
-const char *skip_range_arg(const char *arg)
+const char *skip_range_arg(const char *arg, struct index_state *istate)
 {
 	if (*arg == ':' || (*arg == '^' && *(arg + 1) == ':'))
-		return parse_range_funcname(arg, NULL, NULL, 0, 0, NULL, NULL, NULL);
+		return parse_range_funcname(arg, NULL, NULL,
+					    0, 0, NULL, NULL,
+					    NULL, istate);
 
 	arg = parse_loc(arg, NULL, NULL, 0, -1, NULL);
 
diff --git a/line-range.h b/line-range.h
index d3c54e45aa..e69bf7c017 100644
--- a/line-range.h
+++ b/line-range.h
@@ -1,6 +1,8 @@
 #ifndef LINE_RANGE_H
 #define LINE_RANGE_H
 
+struct index_state;
+
 /*
  * Parse one item in an -L begin,end option w.r.t. the notional file
  * object 'cb_data' consisting of 'lines' lines.
@@ -23,7 +25,7 @@ int parse_range_arg(const char *arg,
 		    nth_line_fn_t nth_line_cb,
 		    void *cb_data, long lines, long anchor,
 		    long *begin, long *end,
-		    const char *path);
+		    const char *path, struct index_state *istate);
 
 /*
  * Scan past a range argument that could be parsed by
@@ -34,6 +36,6 @@ int parse_range_arg(const char *arg,
  * NULL in case the argument is obviously malformed.
  */
 
-const char *skip_range_arg(const char *arg);
+const char *skip_range_arg(const char *arg, struct index_state *istate);
 
 #endif /* LINE_RANGE_H */