diff --git a/bwa.wdl b/bwa.wdl
index 53c38f02a6e45664935405c6b8e08496f821377b..0a8b37fa8ad3fec1d7d3400f6e9b4b5d342dba0a 100644
--- a/bwa.wdl
+++ b/bwa.wdl
@@ -22,7 +22,7 @@ task BwaMem {
         File bamFile = outputPath
     }
     runtime{
-        threads: if defined(threads) then threads else 1
+        cpu: if defined(threads) then threads else 1
         memory: if defined(memory) then memory else 8
     }
 }
diff --git a/star.wdl b/star.wdl
index ddbf5d58b681aeb3e2935196f78a0870967803ad..9e01477a01741bd7f0e426582c416b5b833903f6 100644
--- a/star.wdl
+++ b/star.wdl
@@ -39,7 +39,7 @@ task Star {
     }
 
     runtime {
-        threads: select_first([runThreadN, 1])
+        cpu: select_first([runThreadN, 1])
         memory: select_first([memory, 10])
     }
 }
\ No newline at end of file
diff --git a/stringtie.wdl b/stringtie.wdl
index 6031d7966ede0e19ef3e90a3edb8116767cb20cc..5fdcd6ddedcac23e06eb4728b01289a95eaa665e 100644
--- a/stringtie.wdl
+++ b/stringtie.wdl
@@ -28,6 +28,6 @@ task Stringtie {
     }
 
     runtime {
-        threads: select_first([threads, 1])
+        cpu: select_first([threads, 1])
     }
 }
\ No newline at end of file