diff --git a/tools/dada2/macros.xml b/tools/dada2/macros.xml
index 83c5d4e5d02..3673ad91eec 100644
--- a/tools/dada2/macros.xml
+++ b/tools/dada2/macros.xml
@@ -18,8 +18,8 @@ echo $(R --version | grep version | grep -v GNU)", dada2 version" $(R --vanilla
 
     <xml name="stdio">
         <stdio>
-				<regex match="Error: cannot allocate" source="stderr" level="fatal_oom" description="Out of memory error occurred" />
-				<regex match="'Calloc' could not allocate memory" source="stderr" level="fatal_oom" description="Out of memory error occurred" />
+            <regex match="Error: cannot allocate" source="stderr" level="fatal_oom" description="Out of memory error occurred" />
+            <regex match="'Calloc' could not allocate memory" source="stderr" level="fatal_oom" description="Out of memory error occurred" />
         </stdio>
     </xml>