diff --git a/compiler/options.nim b/compiler/options.nim
index 9edafb17a2..b04f6a9637 100644
--- a/compiler/options.nim
+++ b/compiler/options.nim
@@ -227,8 +227,7 @@ proc setDefaultLibpath*() =
       libpath = parentNimLibPath
 
 proc canonicalizePath*(path: string): string =
-  when not FileSystemCaseSensitive: result = path.expandFilename.toLowerAscii
-  else: result = path.expandFilename
+  result = path.expandFilename
 
 proc shortenDir*(dir: string): string =
   ## returns the interesting part of a dir
diff --git a/tests/modules/UpperCased.nim b/tests/modules/UpperCased.nim
new file mode 100644
index 0000000000..7beffcc5f4
--- /dev/null
+++ b/tests/modules/UpperCased.nim
@@ -0,0 +1,6 @@
+
+# bug #5076
+
+var str*: string
+
+UpperCased.str = "hello"
diff --git a/tests/modules/tuppercased.nim b/tests/modules/tuppercased.nim
new file mode 100644
index 0000000000..65f41becd0
--- /dev/null
+++ b/tests/modules/tuppercased.nim
@@ -0,0 +1,8 @@
+discard """
+  output: "hello"
+"""
+
+import UpperCased
+
+# stress normalization rules:
+echo Upper_Cased.str