diff --git a/ethereumj-core/build.gradle b/ethereumj-core/build.gradle
index 5b1f92ab..0117b63a 100644
--- a/ethereumj-core/build.gradle
+++ b/ethereumj-core/build.gradle
@@ -50,8 +50,8 @@ dependencies {
     compile "org.javassist:javassist:3.15.0-GA"
     compile "commons-logging:commons-logging:1.0" // TODO: provided scope
     compile "org.slf4j:slf4j-api:${slf4jVersion}"
-    compile "org.slf4j:jcl-over-slf4j:${slf4jVersion}" // TODO: runtime scope
-    compile "org.slf4j:slf4j-log4j12:${slf4jVersion}" // TODO: runtime scope
+    runtime "org.slf4j:jcl-over-slf4j:${slf4jVersion}" // TODO: runtime scope
+    runtime "org.slf4j:slf4j-log4j12:${slf4jVersion}" // TODO: runtime scope
     compile "log4j:log4j:${log4jVersion}"
     compile "log4j:apache-log4j-extras:${log4jVersion}"
     compile "org.codehaus.jackson:jackson-mapper-asl:1.9.13"