diff --git a/changes/ticket30078 b/changes/ticket30078
new file mode 100644
index 0000000000..5ab5abdbfd
--- /dev/null
+++ b/changes/ticket30078
@@ -0,0 +1,3 @@
+  o Code simplification and refactoring (shell scripts):
+    - Fix shellcheck warnings in src/test/fuzz/fixup_filenames.sh. Resolves
+      issue 30078.
diff --git a/src/test/fuzz/fixup_filenames.sh b/src/test/fuzz/fixup_filenames.sh
index 68efc1abc5..f730d532a5 100755
--- a/src/test/fuzz/fixup_filenames.sh
+++ b/src/test/fuzz/fixup_filenames.sh
@@ -8,9 +8,9 @@ if [ ! -d "$1" ] ; then
 fi
 
 for fn in "$1"/* ; do
-    prev=`basename "$fn"`
-    post=`sha256sum "$fn" | sed -e 's/ .*//;'`
-    if [ "$prev" == "$post" ] ; then
+    prev=$(basename "$fn")
+    post=$(sha256sum "$fn" | sed -e 's/ .*//;')
+    if [ "$prev" = "$post" ] ; then
       echo "OK $prev"
     else
       echo "mv $prev $post"