diff --git a/fetch2/build.gradle b/fetch2/build.gradle
index cd5c61bc..d0aa2c17 100644
--- a/fetch2/build.gradle
+++ b/fetch2/build.gradle
@@ -66,7 +66,7 @@ dependencies {
     kapt "android.arch.persistence.room:compiler:$room_version"
     api "android.arch.persistence.room:runtime:$room_version"
 
-    implementation project(':fetch2core')
+    api project(':fetch2core')
 
     testImplementation "junit:junit:$junit_version"
     androidTestImplementation "com.android.support.test:runner:$test_runner_version"
diff --git a/fetch2downloaders/build.gradle b/fetch2downloaders/build.gradle
index 7d9ae9d0..0da74f83 100644
--- a/fetch2downloaders/build.gradle
+++ b/fetch2downloaders/build.gradle
@@ -64,7 +64,7 @@ dependencies {
     api "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"
     api "com.squareup.okhttp3:okhttp:$okhttp_version"
 
-    implementation project(':fetch2core')
+    api project(':fetch2core')
 
     testImplementation "junit:junit:$junit_version"
     androidTestImplementation "com.android.support.test:runner:$test_runner_version"
diff --git a/fetch2fileserver/build.gradle b/fetch2fileserver/build.gradle
index bbf7737e..45e075dc 100644
--- a/fetch2fileserver/build.gradle
+++ b/fetch2fileserver/build.gradle
@@ -61,7 +61,7 @@ dependencies {
     kapt "android.arch.persistence.room:compiler:$room_version"
     api "android.arch.persistence.room:runtime:$room_version"
 
-    implementation project(':fetch2core')
+    api project(':fetch2core')
 
     testImplementation "junit:junit:$junit_version"
     androidTestImplementation "com.android.support.test:runner:$test_runner_version"
diff --git a/fetch2okhttp/build.gradle b/fetch2okhttp/build.gradle
index a17e90bc..572184fd 100644
--- a/fetch2okhttp/build.gradle
+++ b/fetch2okhttp/build.gradle
@@ -64,7 +64,7 @@ dependencies {
     api "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"
     api "com.squareup.okhttp3:okhttp:$okhttp_version"
 
-    implementation project(':fetch2core')
+    api project(':fetch2core')
 
     testImplementation "junit:junit:$junit_version"
     androidTestImplementation "com.android.support.test:runner:$test_runner_version"