diff --git a/workflow/rules/mapping.smk b/workflow/rules/mapping.smk
index 6ef3150ae..c9922ca83 100644
--- a/workflow/rules/mapping.smk
+++ b/workflow/rules/mapping.smk
@@ -136,6 +136,8 @@ rule recalibrate_base_qualities:
     params:
         extra=config["params"]["gatk"]["BaseRecalibrator"],
         java_opts="",
+    resources:
+        mem_mb=1024,
     log:
         "logs/gatk/baserecalibrator/{sample}.log",
     threads: 8