diff --git a/astrocyte_pkg.yml b/astrocyte_pkg.yml
index 492039e56f5f2177b853a39e1aa4d23ae89737a6..baa412c8178e94ef427d62b96cc9ca34ea201aae 100755
--- a/astrocyte_pkg.yml
+++ b/astrocyte_pkg.yml
@@ -126,11 +126,11 @@ workflow_parameters:
 
   - id: version
     type: select
-    default: 3.0.2
+    default: '3.0.2'
     choices:
-      - [ 3.0.2, '3.0.2']
-      - [ 3.0.1, '3.0.1']
-      - [ 2.1.1, '2.1.1']
+      - [ '3.0.2', '3.0.2']
+      - [ '3.0.1', '3.0.1']
+      - [ '2.1.1', '2.1.1']
     required: true
     description: |
       10x cellranger version.
diff --git a/workflow/main.nf b/workflow/main.nf
index 2e15c89dec62c43b1618fd660569938f572c5d1d..f16d221dfe2dca69cee8a08e5dc99027890744d6 100755
--- a/workflow/main.nf
+++ b/workflow/main.nf
@@ -9,7 +9,7 @@ params.designFile = "$baseDir/../test_data/design.csv"
 params.genome = '/project/apps_database/cellranger/refdata-cellranger-GRCh38-1.2.0'
 params.expectCells = 10000
 params.forceCells = 0
-params.version = 3.0.2
+params.version = '3.0.2'
 
 // Define regular variables
 designLocation = Channel
@@ -90,7 +90,7 @@ process count211 {
   file("**/outs/**") into outPaths211
 
   when:
-  version == 211
+  version == '2.1.1'
 
   script:
   if (forceCells211 == 0){
@@ -121,7 +121,7 @@ process count301 {
   file("**/outs/**") into outPaths301
 
   when:
-  version == 301
+  version == '3.0.1'
 
   script:
   if (forceCells301 == 0){
@@ -152,7 +152,7 @@ process count302 {
   file("**/outs/**") into outPaths302
 
   when:
-  version == 302
+  version == '3.0.2'
 
   script:
   if (forceCells302 == 0){