diff --git a/conf/test.config b/conf/test.config
index 03b8307..b3ad7bd 100644
--- a/conf/test.config
+++ b/conf/test.config
@@ -51,7 +51,7 @@ params {
 process {
     withName: MALT_RUN {
         maxForks = 1
-        ext.args = "-m ${params.malt_mode} -J-Xmx8G"
+        ext.args = "-m ${params.malt_mode} -J-Xmx12G"
     }
     withName: MEGAN_RMA2INFO_TSV {
         maxForks = 1