diff --git a/gitk-git/gitk b/gitk-git/gitk
index 076ca3687d7653..a792f48e5a1a47 100755
--- a/gitk-git/gitk
+++ b/gitk-git/gitk
@@ -7847,7 +7847,7 @@ proc gettreeline {gtf id} {
         if {[string index $fname 0] eq "\""} {
             set fname [lindex $fname 0]
         }
-        set fname [encoding convertfrom $fname]
+        set fname [encoding convertfrom utf-8 $fname]
         lappend treefilelist($id) $fname
     }
     if {![eof $gtf]} {
@@ -8109,7 +8109,7 @@ proc gettreediffline {gdtf ids} {
             if {[string index $file 0] eq "\""} {
                 set file [lindex $file 0]
             }
-            set file [encoding convertfrom $file]
+            set file [encoding convertfrom utf-8 $file]
             if {$file ne [lindex $treediff end]} {
                 lappend treediff $file
                 lappend sublist $file
@@ -8254,7 +8254,7 @@ proc makediffhdr {fname ids} {
     global ctext curdiffstart treediffs diffencoding
     global ctext_file_names jump_to_here targetline diffline
 
-    set fname [encoding convertfrom $fname]
+    set fname [encoding convertfrom utf-8 $fname]
     set diffencoding [get_path_encoding $fname]
     set i [lsearch -exact $treediffs($ids) $fname]
     if {$i >= 0} {
@@ -8316,7 +8316,7 @@ proc parseblobdiffline {ids line} {
 
     if {![string compare -length 5 "diff " $line]} {
         if {![regexp {^diff (--cc|--git) } $line m type]} {
-            set line [encoding convertfrom $line]
+            set line [encoding convertfrom utf-8 $line]
             $ctext insert end "$line\n" hunksep
             continue
         }
@@ -8365,7 +8365,7 @@ proc parseblobdiffline {ids line} {
         makediffhdr $fname $ids
 
     } elseif {![string compare -length 16 "* Unmerged path " $line]} {
-        set fname [encoding convertfrom [string range $line 16 end]]
+        set fname [encoding convertfrom utf-8 [string range $line 16 end]]
         $ctext insert end "\n"
         set curdiffstart [$ctext index "end - 1c"]
         lappend ctext_file_names $fname
@@ -8418,7 +8418,7 @@ proc parseblobdiffline {ids line} {
             if {[string index $fname 0] eq "\""} {
                 set fname [lindex $fname 0]
             }
-            set fname [encoding convertfrom $fname]
+            set fname [encoding convertfrom utf-8 $fname]
             set i [lsearch -exact $treediffs($ids) $fname]
             if {$i >= 0} {
                 setinlist difffilestart $i $curdiffstart
@@ -8437,6 +8437,7 @@ proc parseblobdiffline {ids line} {
             set diffinhdr 0
             return
         }
+        set line [encoding convertfrom utf-8 $line]
         $ctext insert end "$line\n" filesep
 
     } else {
@@ -12405,7 +12406,7 @@ proc cache_gitattr {attr pathlist} {
             foreach row [split $rlist "\n"] {
                 if {[regexp "(.*): $attr: (.*)" $row m path value]} {
                     if {[string index $path 0] eq "\""} {
-                        set path [encoding convertfrom [lindex $path 0]]
+                        set path [encoding convertfrom utf-8 [lindex $path 0]]
                     }
                     set path_attr_cache($attr,$path) $value
                 }