diff --git a/poi-excelant/build.gradle b/poi-excelant/build.gradle
index 94834f7108..304dd89746 100644
--- a/poi-excelant/build.gradle
+++ b/poi-excelant/build.gradle
@@ -154,7 +154,7 @@ task testJar(type: Jar, dependsOn: [ testClasses, cacheTest9 ] ) {
         }
     }
 
-    from sourceSets.test.output + sourceSets.main.output
+    from sourceSets.test.output
 
     manifest {
         attributes('Automatic-Module-Name': MODULE_NAME, 'Multi-Release': 'true')
diff --git a/poi-integration/build.gradle b/poi-integration/build.gradle
index 031f8b9a9c..b60aa4717e 100644
--- a/poi-integration/build.gradle
+++ b/poi-integration/build.gradle
@@ -147,7 +147,7 @@ task testJar(type: Jar, dependsOn: [ testClasses, cacheTest9 ] ) {
         }
     }
 
-    from sourceSets.test.output + sourceSets.main.output
+    from sourceSets.test.output
 
     manifest {
         attributes('Automatic-Module-Name': MODULE_NAME, 'Multi-Release': 'true')
diff --git a/poi-ooxml/build.gradle b/poi-ooxml/build.gradle
index 54bdd07456..415874a4f8 100644
--- a/poi-ooxml/build.gradle
+++ b/poi-ooxml/build.gradle
@@ -247,7 +247,7 @@ task testJar(type: Jar, dependsOn: testClasses) {
         }
     }
 
-    from sourceSets.test.output + sourceSets.main.output
+    from sourceSets.test.output
 
     manifest {
         attributes('Automatic-Module-Name': MODULE_NAME, 'Multi-Release': 'true')
diff --git a/poi-scratchpad/build.gradle b/poi-scratchpad/build.gradle
index 8c2549643b..704f33cb8e 100644
--- a/poi-scratchpad/build.gradle
+++ b/poi-scratchpad/build.gradle
@@ -133,7 +133,7 @@ task testJar(type: Jar, dependsOn: testClasses) {
         }
     }
 
-    from sourceSets.test.output + sourceSets.main.output
+    from sourceSets.test.output
 
     manifest {
         attributes('Automatic-Module-Name': MODULE_NAME, 'Multi-Release': 'true')
diff --git a/poi/build.gradle b/poi/build.gradle
index b2aa41d8bb..b1bc4e4059 100644
--- a/poi/build.gradle
+++ b/poi/build.gradle
@@ -162,7 +162,7 @@ task testJar(type: Jar, dependsOn: [ testClasses, cacheTest9 ]) {
         }
     }
 
-    from sourceSets.test.output + sourceSets.main.output
+    from sourceSets.test.output
 
     manifest {
         attributes('Automatic-Module-Name': MODULE_NAME, 'Multi-Release': 'true')