diff --git a/workflow/rules/2.1_sample_qc.smk b/workflow/rules/2.1_sample_qc.smk
index 5e78749..cf4b857 100644
--- a/workflow/rules/2.1_sample_qc.smk
+++ b/workflow/rules/2.1_sample_qc.smk
@@ -53,7 +53,7 @@ rule qualimap:
         runtime="6h",
     shell:
         """
-        qualimap bamqc -bam {input.bam} --java-mem-size {resources.mem_mb}M \
+        qualimap bamqc -bam {input.bam} --java-mem-size={resources.mem_mb}M \
             -outdir {output.fold} 2> {log}
         """
 
@@ -80,7 +80,7 @@ rule qualimap_userprovided:
         runtime="6h",
     shell:
         """
-        qualimap bamqc -bam {input.bam} --java-mem-size {resources.mem_mb}M \
+        qualimap bamqc -bam {input.bam} --java-mem-size={resources.mem_mb}M \
             -outdir {output.fold} 2> {log}
         """