diff --git a/library/core/build.gradle b/library/core/build.gradle
index abfcc10adf..8b8c3fd520 100644
--- a/library/core/build.gradle
+++ b/library/core/build.gradle
@@ -62,7 +62,7 @@ dependencies {
     androidTestImplementation 'com.linkedin.dexmaker:dexmaker:' + dexmakerVersion
     androidTestImplementation 'com.linkedin.dexmaker:dexmaker-mockito:' + dexmakerVersion
     androidTestImplementation(project(modulePrefix + 'testutils')) {
-        exclude module: gradle.ext.exoplayerModulePrefix + 'library-core'
+        exclude module: modulePrefix.substring(1) + 'library-core'
     }
     testImplementation 'com.google.guava:guava:' + guavaVersion
     testImplementation 'org.robolectric:robolectric:' + robolectricVersion