diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 9e76135a8..778dbb53b 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -715,8 +715,8 @@ jobs:
         COMPARER='./googlebenchmark-prefix/src/googlebenchmark/tools/compare.py'
         for baseline in *-$hash.json
         do
-          common=${baseline:0:-12}
-          pr_change=$(find . ! -name '*$hash.json'  -name "${common}*.json")
+          common=${baseline%$hash.json}
+          pr_change=$(find . ! -name "*$hash.json" -name "$common*.json")
 
           echo "Running 'python3 ${COMPARER} benchmarks '${baseline}' '${pr_change}''"
           python3 ${COMPARER} benchmarks ${baseline} ${pr_change}
diff --git a/cmake/modules/AddCladBenchmark.cmake b/cmake/modules/AddCladBenchmark.cmake
index f292f26fa..17983d0aa 100644
--- a/cmake/modules/AddCladBenchmark.cmake
+++ b/cmake/modules/AddCladBenchmark.cmake
@@ -1,12 +1,12 @@
 # Find the current branch.
 execute_process(WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
-                COMMAND git rev-parse --abbrev-ref HEAD
-                OUTPUT_VARIABLE CURRENT_REPO_BRANCH
+                COMMAND git rev-parse HEAD
+                OUTPUT_VARIABLE CURRENT_REPO_COMMIT
                 OUTPUT_STRIP_TRAILING_WHITESPACE)
-string(REPLACE "/" "" CURRENT_REPO_BRANCH ${CURRENT_REPO_BRANCH})
+string(REPLACE "/" "" CURRENT_REPO_COMMIT ${CURRENT_REPO_COMMIT})
 
 # Ask cmake to reconfigure each time we change the branch so that it can change
-# the value of CURRENT_REPO_BRANCH.
+# the value of CURRENT_REPO_COMMIT.
 set_property(DIRECTORY APPEND PROPERTY
              CMAKE_CONFIGURE_DEPENDS "${CMAKE_SOURCE_DIR}/.git/HEAD")
 
@@ -74,7 +74,7 @@ function(CB_ADD_GBENCHMARK benchmark)
   # Add benchmark as a CTest
   add_test(NAME clad-${benchmark}
     COMMAND ${benchmark} --benchmark_out_format=json
-    --benchmark_out=clad-gbenchmark-${benchmark}-${CURRENT_REPO_BRANCH}.json
+    --benchmark_out=clad-gbenchmark-${benchmark}-${CURRENT_REPO_COMMIT}.json
     --benchmark_color=false)
   set_tests_properties(clad-${benchmark} PROPERTIES
                        TIMEOUT "${TIMEOUT_VALUE}"