diff --git a/test/INTEGRATION_TESTING.md b/test/INTEGRATION_TESTING.md
index 7520a0d..922624e 100644
--- a/test/INTEGRATION_TESTING.md
+++ b/test/INTEGRATION_TESTING.md
@@ -18,6 +18,7 @@ Each contributor creates their own test accounts. The script expects a standard
 2. Create two repositories:
    - `gitbackup-test-public` (public)
    - `gitbackup-test-private` (private)
+3. Fork any public repo and rename it to `gitbackup-test-ignore-fork` (for testing `-ignore-fork`)
 
 ### GitLab
 
@@ -25,6 +26,7 @@ Each contributor creates their own test accounts. The script expects a standard
 2. Create two projects:
    - `gitbackup-test-public` (public)
    - `gitbackup-test-private` (private)
+3. Fork any public project and rename it to `gitbackup-test-ignore-fork` (for testing `-ignore-fork`)
 
 ### Bitbucket
 
@@ -32,6 +34,7 @@ Each contributor creates their own test accounts. The script expects a standard
 2. Create a workspace and two repositories:
    - `gitbackup-test-public` (public)
    - `gitbackup-test-private` (private)
+3. Fork any public repo into your workspace and rename it to `gitbackup-test-ignore-fork` (for testing `-ignore-fork`)
 
 ### Forgejo (Codeberg)
 
@@ -39,6 +42,7 @@ Each contributor creates their own test accounts. The script expects a standard
 2. Create two repositories:
    - `gitbackup-test-public` (public)
    - `gitbackup-test-private` (private)
+3. Fork any public repo and rename it to `gitbackup-test-ignore-fork` (for testing `-ignore-fork`)
 
 ## Environment Setup
 
diff --git a/test/integration-test.sh b/test/integration-test.sh
index b95a351..f263280 100755
--- a/test/integration-test.sh
+++ b/test/integration-test.sh
@@ -192,6 +192,56 @@ run_service_tests() {
         fail "$service ($label): ignore-private — gitbackup exited with error"
     fi
 
+    rm -rf "$tmpdir"
+
+    # Test 5: Ignore fork
+    tmpdir=$(mktemp -d)
+
+    echo "  Running clone without -ignore-fork (fork should be present)..."
+    if run_gitbackup -service "$service" -backupdir "$tmpdir" $extra_flags; then
+        if check_repo_exists "$tmpdir" "gitbackup-test-ignore-fork"; then
+            echo "    Found gitbackup-test-ignore-fork (forked repo)"
+            pass "$service ($label): fork present without -ignore-fork"
+        else
+            echo "    Missing gitbackup-test-ignore-fork (forked repo)"
+            fail "$service ($label): fork present without -ignore-fork — gitbackup-test-ignore-fork not found"
+        fi
+    else
+        fail "$service ($label): fork present without -ignore-fork — gitbackup exited with error"
+    fi
+
+    rm -rf "$tmpdir"
+
+    # Test 6: Ignore fork (with flag)
+    tmpdir=$(mktemp -d)
+
+    echo "  Running clone with -ignore-fork..."
+    if run_gitbackup -service "$service" -backupdir "$tmpdir" -ignore-fork $extra_flags; then
+        if check_repo_exists "$tmpdir" "gitbackup-test-ignore-fork"; then
+            echo "    Found gitbackup-test-ignore-fork (unexpected — should be skipped)"
+            fail "$service ($label): ignore-fork — forked repo should have been skipped"
+        else
+            echo "    Correctly skipped gitbackup-test-ignore-fork"
+            # Verify non-fork repos are still present
+            all_found=true
+            for repo_name in $EXPECTED_REPOS; do
+                if check_repo_exists "$tmpdir" "$repo_name"; then
+                    echo "    Found $repo_name"
+                else
+                    echo "    Missing $repo_name"
+                    all_found=false
+                fi
+            done
+            if $all_found; then
+                pass "$service ($label): ignore-fork"
+            else
+                fail "$service ($label): ignore-fork — non-fork repos missing"
+            fi
+        fi
+    else
+        fail "$service ($label): ignore-fork — gitbackup exited with error"
+    fi
+
     rm -rf "$tmpdir"
     trap - RETURN
 }