diff --git a/conf/test.config b/conf/test.config
index 107beb5..0bd09ab 100644
--- a/conf/test.config
+++ b/conf/test.config
@@ -34,4 +34,10 @@ params {
     run_malt                              = true
     run_metaphlan3                        = true
     run_centrifuge                        = true
+ }
+
+process {
+    withName: MALT_RUN {
+        maxForks = 1
+    }
 }