diff --git a/native-gradle-plugin/src/test/groovy/org/graalvm/buildtools/gradle/tasks/AbstractPluginTest.groovy b/native-gradle-plugin/src/test/groovy/org/graalvm/buildtools/gradle/tasks/AbstractPluginTest.groovy
index b603458b3..f4a0f6346 100644
--- a/native-gradle-plugin/src/test/groovy/org/graalvm/buildtools/gradle/tasks/AbstractPluginTest.groovy
+++ b/native-gradle-plugin/src/test/groovy/org/graalvm/buildtools/gradle/tasks/AbstractPluginTest.groovy
@@ -204,6 +204,6 @@ abstract class AbstractPluginTest extends Specification {
     }
 
     private static String normalizeString(String input) {
-        input.replace("\r\n", "\n")
+        input.replace("\r\n", "\n").replace("\\\\", "/")
     }
 }
diff --git a/native-gradle-plugin/src/testFixtures/groovy/org/graalvm/buildtools/gradle/fixtures/AbstractFunctionalTest.groovy b/native-gradle-plugin/src/testFixtures/groovy/org/graalvm/buildtools/gradle/fixtures/AbstractFunctionalTest.groovy
index b480e24dd..e93df23fc 100644
--- a/native-gradle-plugin/src/testFixtures/groovy/org/graalvm/buildtools/gradle/fixtures/AbstractFunctionalTest.groovy
+++ b/native-gradle-plugin/src/testFixtures/groovy/org/graalvm/buildtools/gradle/fixtures/AbstractFunctionalTest.groovy
@@ -287,6 +287,6 @@ abstract class AbstractFunctionalTest extends Specification {
     }
 
     private static String normalizeString(String input) {
-        input.replace("\r\n", "\n")
+        input.replace("\r\n", "\n").replace("\\\\", "/")
     }
 }
diff --git a/native-maven-plugin/src/testFixtures/groovy/org/graalvm/buildtools/maven/AbstractGraalVMMavenFunctionalTest.groovy b/native-maven-plugin/src/testFixtures/groovy/org/graalvm/buildtools/maven/AbstractGraalVMMavenFunctionalTest.groovy
index f5ff112ea..00c593bc6 100644
--- a/native-maven-plugin/src/testFixtures/groovy/org/graalvm/buildtools/maven/AbstractGraalVMMavenFunctionalTest.groovy
+++ b/native-maven-plugin/src/testFixtures/groovy/org/graalvm/buildtools/maven/AbstractGraalVMMavenFunctionalTest.groovy
@@ -231,7 +231,7 @@ abstract class AbstractGraalVMMavenFunctionalTest extends Specification {
     }
 
     private static String normalizeString(String input) {
-        input.replace("\r\n", "\n")
+        input.replace("\r\n", "\n").replace("\\\\", "/")
     }
 
     String getArgFileContents() {