diff --git a/src/atlasComponents/userAnnotations/tools/service.ts b/src/atlasComponents/userAnnotations/tools/service.ts
index f77ec97b490bcb52fb27784b28f1202144a2f96e..5b2f145e33449eb4353c234108cd8818dce39553 100644
--- a/src/atlasComponents/userAnnotations/tools/service.ts
+++ b/src/atlasComponents/userAnnotations/tools/service.ts
@@ -33,7 +33,7 @@ type TAnnotationMetadata = {
   desc: string
 }
 
-const descType: 'siibra-ex/meta/desc' = 'siibra-ex/meta/desc'
+const descType = 'siibra-ex/meta/desc'
 type TTypedAnnMetadata = {
   '@type': 'siibra-ex/meta/desc'
 } & TAnnotationMetadata
diff --git a/src/util/patchPureConstants.ts b/src/util/patchPureConstants.ts
index fb1b4ad5b95c613133be272ba8874d39503f6df4..55ff455615c145c59ac2906fba55625fabdf6d1a 100644
--- a/src/util/patchPureConstants.ts
+++ b/src/util/patchPureConstants.ts
@@ -49,10 +49,10 @@ async function getInterpolatedPatchObj(targetName: string, labelIndex: number){
       "volumeSrc": {
         'minds/core/referencespace/v1.0.0/a1655b99-82f1-420f-a3c2-fe80fd4c8588': {
           "collect": [{
-            "@type": "fzj/tmp/volume_type/v0.0.1" as "fzj/tmp/volume_type/v0.0.1",
+            "@type": "fzj/tmp/volume_type/v0.0.1" as const,
             "@id": "fzj/tmp/volume_type/v0.0.1/interpolated",
             "name": "Julich Brain v2.5 interpolated map",
-            "volume_type": "neuroglancer/precomputed" as "neuroglancer/precomputed",
+            "volume_type": "neuroglancer/precomputed" as const,
             "url": "https://neuroglancer.humanbrainproject.org/precomputed/BigBrainRelease.2015/2019_05_22_interpolated_areas",
             "detail": {
               "neuroglancer/precomputed": {
@@ -93,10 +93,10 @@ async function getIndividualMap(parentName: string, regionName: string, url: str
       "volumeSrc": {
         'minds/core/referencespace/v1.0.0/a1655b99-82f1-420f-a3c2-fe80fd4c8588': {
           "collect": [{
-            "@type": "fzj/tmp/volume_type/v0.0.1" as "fzj/tmp/volume_type/v0.0.1",
+            "@type": "fzj/tmp/volume_type/v0.0.1" as const,
             "@id": `fzj/tmp/volume_type/v0.0.1/${volumeId}`,
             "name": "Julich Brain v2.5 detailed map",
-            "volume_type": "neuroglancer/precomputed" as "neuroglancer/precomputed",
+            "volume_type": "neuroglancer/precomputed" as const,
             "url": url,
             "detail": {
               "neuroglancer/precomputed": {