diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 7a7654a..51c998f 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -10,12 +10,21 @@ on:
 
 jobs:
   scala:
-    runs-on: ubuntu-latest
     strategy:
+      fail-fast: false # remove when PR is finished, just to make sure we don't make regression
       matrix:
         JDK: [ 8, 17 ]
+        os:
+          - ubuntu-latest
+          - windows-latest
+    runs-on: ${{ matrix.os }}
 
     steps:
+      - name: Ignore line ending differences in git
+        if: contains(runner.os, 'windows')
+        shell: bash
+        run: git config --global core.autocrlf false
+
       - name: checkout the repo
         uses: actions/checkout@v4
         with:
diff --git a/src/main/scala/org/scoverage/coveralls/CoberturaMultiSourceReader.scala b/src/main/scala/org/scoverage/coveralls/CoberturaMultiSourceReader.scala
index 084871b..aec5f57 100644
--- a/src/main/scala/org/scoverage/coveralls/CoberturaMultiSourceReader.scala
+++ b/src/main/scala/org/scoverage/coveralls/CoberturaMultiSourceReader.scala
@@ -114,7 +114,7 @@ class CoberturaMultiSourceReader(
 
   protected def lineCoverage(sourceFile: String) = {
     val filenamePath =
-      splitPath(new File(sourceFile))._2.replace(File.separator, "/")
+      splitPath(new File(sourceFile))._2
 
     lineCoverageMap(filenamePath)
   }
@@ -130,9 +130,7 @@ class CoberturaMultiSourceReader(
     val lineHitMap = lineCoverage(source)
     val fullLineHit = (0 until lineCount).map(i => lineHitMap.get(i + 1))
 
-    val sourceNormalized = source.replace(File.separator, "/")
-
-    SourceFileReport(sourceNormalized, fullLineHit.toList)
+    SourceFileReport(source, fullLineHit.toList)
   }
 }
 
diff --git a/src/main/scala/org/scoverage/coveralls/CoverallPayloadWriter.scala b/src/main/scala/org/scoverage/coveralls/CoverallPayloadWriter.scala
index afc1518..65f4ee7 100644
--- a/src/main/scala/org/scoverage/coveralls/CoverallPayloadWriter.scala
+++ b/src/main/scala/org/scoverage/coveralls/CoverallPayloadWriter.scala
@@ -95,8 +95,7 @@ class CoverallPayloadWriter(
   }
 
   def addSourceFile(report: SourceFileReport) = {
-    val repoRootDirStr =
-      repoRootDir.getCanonicalPath.replace(File.separator, "/") + "/"
+    val repoRootDirStr = repoRootDir.getCanonicalPath + File.separator
 
     // create a name relative to the project root (rather than the module root)
     // this is needed so that coveralls can find the file in git.