diff --git a/libs/pika/runtime/tests/unit/CMakeLists.txt b/libs/pika/runtime/tests/unit/CMakeLists.txt
index e120bac5c..49a2872fa 100644
--- a/libs/pika/runtime/tests/unit/CMakeLists.txt
+++ b/libs/pika/runtime/tests/unit/CMakeLists.txt
@@ -32,7 +32,7 @@ else()
   string(
     CONCAT
       process_mask_flag_expected_output
-      "   0: PU L#0\\(P#0\\), Core L#0\\(P#0\\)(, Socket L#[0-9]+\\(P#[0-9]+\\))?(, NUMANode L#[0-9]+\\(P#[0-9]+\\))?(, Socket L#[0-9]+\\(P#[0-9]+\\))?, on pool \"default\"\n"
+      "   0: PU L#0\\(P#0\\), Core L#0\\(P#[0-9]+\\)(, Socket L#[0-9]+\\(P#[0-9]+\\))?(, NUMANode L#[0-9]+\\(P#[0-9]+\\))?(, Socket L#[0-9]+\\(P#[0-9]+\\))?, on pool \"default\"\n"
       "   1: PU L#[0-9]+\\(P#1\\), Core L#[0-9]+\\(P#[0-9]+\\)(, Socket L#[0-9]+\\(P#[0-9]+\\))?(, NUMANode L#[0-9]+\\(P#[0-9]+\\))?(, Socket L#[0-9]+\\(P#[0-9]+\\))?, on pool \"default\"\n"
       "All tests passed."
   )