diff --git a/tests/spread/core24-suites/environment/test-variables/task.yaml b/tests/spread/core24-suites/environment/test-variables/task.yaml
index f9fb09d0a2..22d50aeed0 100644
--- a/tests/spread/core24-suites/environment/test-variables/task.yaml
+++ b/tests/spread/core24-suites/environment/test-variables/task.yaml
@@ -8,6 +8,7 @@ systems:
 
 environment:
   SNAP/test_variables: test-variables
+  SNAPCRAFT_PARALLEL_BUILD_COUNT: 5
 
 prepare: |
   #shellcheck source=tests/spread/tools/snapcraft-yaml.sh
@@ -35,7 +36,7 @@ execute: |
       "^SNAPCRAFT_PROJECT_GRADE=devel$" \
       "^SNAPCRAFT_PROJECT_NAME=variables$" \
       "^SNAPCRAFT_PROJECT_VERSION=1$" \
-      "^SNAPCRAFT_PARALLEL_BUILD_COUNT=[0-9]\+$" \
+      "^SNAPCRAFT_PARALLEL_BUILD_COUNT=5$" \
       "^SNAPCRAFT_PROJECT_DIR=${root}$" \
       "^SNAPCRAFT_PART_SRC=${root}/parts/hello/src$" \
       "^SNAPCRAFT_PART_SRC_WORK=${root}/parts/hello/src$" \
@@ -48,7 +49,7 @@ execute: |
       "^CRAFT_ARCH_TRIPLET_BUILD_ON=x86_64-linux-gnu$" \
       "^CRAFT_ARCH_BUILD_FOR=s390x$" \
       "^CRAFT_ARCH_TRIPLET_BUILD_FOR=s390x-linux-gnu$" \
-      "^CRAFT_PARALLEL_BUILD_COUNT=[0-9]\+$" \
+      "^CRAFT_PARALLEL_BUILD_COUNT=5$" \
       "^CRAFT_PROJECT_DIR=${root}$" \
       "^CRAFT_PART_NAME=hello$" \
       "^CRAFT_PART_SRC=${root}/parts/hello/src$" \