diff --git a/BankingUiCommon/build.gradle b/BankingUiCommon/build.gradle
index d8f298af..f9ecc1d4 100644
--- a/BankingUiCommon/build.gradle
+++ b/BankingUiCommon/build.gradle
@@ -29,5 +29,5 @@ dependencies {
     testImplementation "junit:junit:$junitVersion"
     testImplementation "org.assertj:assertj-core:$assertJVersion"
 
-    testImplementation "org.slf4j:slf4j-simple:$slf4JVersion"
+    testImplementation "org.slf4j:slf4j-simple:$slf4jVersion"
 }
\ No newline at end of file
diff --git a/build.gradle b/build.gradle
index 896d4f24..34f5384b 100644
--- a/build.gradle
+++ b/build.gradle
@@ -49,7 +49,7 @@ ext {
     mockitoVersion = '2.22.0'
     mockitoKotlinVersion = '1.6.0'
 
-    slf4JVersion = '1.7.26'
+    slf4jVersion = '1.7.26'
     logbackVersion = '1.2.3'
 }
 
diff --git a/fints4javaAndroidApp/build.gradle b/fints4javaAndroidApp/build.gradle
index 7e64c37d..b8400da0 100644
--- a/fints4javaAndroidApp/build.gradle
+++ b/fints4javaAndroidApp/build.gradle
@@ -72,7 +72,7 @@ dependencies {
         exclude group: 'com.android.support', module: 'design'
     }
 
-    implementation "org.slf4j:slf4j-android:$slf4JVersion"
+    implementation "org.slf4j:slf4j-android:$slf4jVersion"
 
 
     implementation "androidx.multidex:multidex:$multiDexVersion"
diff --git a/persistence/LuceneBankingPersistence/build.gradle b/persistence/LuceneBankingPersistence/build.gradle
index e118b0b7..e851d381 100644
--- a/persistence/LuceneBankingPersistence/build.gradle
+++ b/persistence/LuceneBankingPersistence/build.gradle
@@ -25,4 +25,6 @@ dependencies {
     testImplementation "org.assertj:assertj-core:$assertJVersion"
 
     testImplementation "org.mockito:mockito-core:$mockitoVersion"
+
+    testImplementation "org.slf4j:slf4j-simple:$slf4jVersion"
 }
\ No newline at end of file