diff --git a/tests/scripts/quiet/cmake b/tests/scripts/quiet/cmake
index 930931d..a34365b 100755
--- a/tests/scripts/quiet/cmake
+++ b/tests/scripts/quiet/cmake
@@ -12,8 +12,8 @@
 # export VERBOSE_LOGS=1
 
 # don't silence invocations containing these arguments
-export NO_SILENCE=" --version "
+NO_SILENCE=" --version "
 
-export TOOL="cmake"
+TOOL="cmake"
 
-exec "$(dirname "$0")/quiet.sh" "$@"
+. "$(dirname "$0")/quiet.sh"
diff --git a/tests/scripts/quiet/make b/tests/scripts/quiet/make
index d022551..920e5b8 100755
--- a/tests/scripts/quiet/make
+++ b/tests/scripts/quiet/make
@@ -12,8 +12,8 @@
 # export VERBOSE_LOGS=1
 
 # don't silence invocations containing these arguments
-export NO_SILENCE=" --version | test "
+NO_SILENCE=" --version | test "
 
-export TOOL="make"
+TOOL="make"
 
-exec "$(dirname "$0")/quiet.sh" "$@"
+. "$(dirname "$0")/quiet.sh"
diff --git a/tests/scripts/quiet/quiet.sh b/tests/scripts/quiet/quiet.sh
old mode 100755
new mode 100644
index 30ee569..0f26184
--- a/tests/scripts/quiet/quiet.sh
+++ b/tests/scripts/quiet/quiet.sh
@@ -22,9 +22,13 @@
 #              be silenced, e.g. " --version | test ". In this example, "make lib test" will
 #              not be silent, but "make lib" will be.
 
-# Locate original tool
-TOOL_WITH_PATH=$(dirname "$0")/$TOOL
-ORIGINAL_TOOL=$(type -ap "${TOOL}" | grep -v -Fx "$TOOL_WITH_PATH" | head -n1)
+# Identify path to original tool. There is an edge-case here where the quiet wrapper is on the path via
+# a symlink or relative path, but "type -ap" yields the wrapper with it's normalised path. We use
+# the -ef operator to compare paths, to avoid picking the wrapper in this case (to avoid infinitely
+# recursing).
+while IFS= read -r ORIGINAL_TOOL; do
+    if ! [[ $ORIGINAL_TOOL -ef "$0" ]]; then break; fi
+done < <(type -ap -- "$TOOL")
 
 print_quoted_args() {
     # similar to printf '%q' "$@"