diff --git a/.github/scripts/rename/definitions.sh b/.github/scripts/rename/definitions.sh
index d9f04b91e6..53fcffe860 100755
--- a/.github/scripts/rename/definitions.sh
+++ b/.github/scripts/rename/definitions.sh
@@ -1,5 +1,18 @@
 #!/bin/bash
 
+# Exit the script as soon as an error occurs.
+set -e
+
+# On MacOS, ensure that GNU sed is installed and available as `gsed`.
+SED_COMMAND=sed
+if [[ "$OSTYPE" == "darwin"* ]]; then
+  if ! command -v gsed &> /dev/null; then
+      echo "Error: gsed is not installed. Please install it using 'brew install gnu-sed'."
+      exit 1
+  fi
+  SED_COMMAND=gsed
+fi
+
 # This script renames definitions, such as include guards, in this project.
 # Specifically, it renames "RIPPLED_XXX" and "RIPPLE_XXX" to "XRPL_XXX" by
 # scanning all cmake, header, and source files in the specified directory and
@@ -20,12 +33,10 @@ fi
 
 find "${DIRECTORY}" -type f \( -name "*.h" -o -name "*.hpp" -o -name "*.ipp" -o -name "*.cpp" \) | while read -r FILE; do
     echo "Processing file: ${FILE}"
-    sed -i'.bak' -E 's@#(define|endif|if|ifdef|ifndef)(.*)(RIPPLED_|RIPPLE_)([A-Z0-9_]+)@#\1\2XRPL_\4@g' "${FILE}"
-    rm "${FILE}.bak"
+    ${SED_COMMAND} -i -E 's@#(define|endif|if|ifdef|ifndef)(.*)(RIPPLED_|RIPPLE_)([A-Z0-9_]+)@#\1\2XRPL_\4@g' "${FILE}"
 done
 find "${DIRECTORY}" -type f \( -name "*.cmake" -o -name "*.txt" \) | while read -r FILE; do
     echo "Processing file: ${FILE}"
-    sed -i'.bak' -E 's@(RIPPLED_|RIPPLE_)([A-Z0-9_]+)@XRPL_\2@g' "${FILE}"
-    rm "${FILE}.bak"
+    ${SED_COMMAND} -i -E 's@(RIPPLED_|RIPPLE_)([A-Z0-9_]+)@XRPL_\2@g' "${FILE}"
 done
 echo "Renaming complete."