diff --git a/tests/scripts/all.sh b/tests/scripts/all.sh
index 52e196f11..28d31b9c7 100755
--- a/tests/scripts/all.sh
+++ b/tests/scripts/all.sh
@@ -1031,12 +1031,22 @@ cd "$MBEDTLS_ROOT_DIR"
 rm -rf "$OUT_OF_SOURCE_DIR"
 unset MBEDTLS_ROOT_DIR
 
+# Test that the function mbedtls_platform_zeroize() is not optimized away by
+# different combinations of compilers and optimization flags by using an
+# auxiliary GDB script. Unfortunately, GDB does not return error values to the
+# system in all cases that the script fails, so we must manually search the
+# output to check whether the pass string is present and no failure strings
+# were printed.
 for optimization_flag in -O2 -O3 -Ofast -Os; do
     for compiler in clang gcc; do
         msg "test: $compiler $optimization_flag, mbedtls_platform_zeroize()"
         cleanup
-        CC="$compiler" DEBUG=1 CFLAGS="$optimization_flag" make programs
-        gdb -x tests/scripts/test_zeroize.gdb -nw -batch -nx
+        make programs CC="$compiler" DEBUG=1 CFLAGS="$optimization_flag"
+        if_build_succeeded gdb -x tests/scripts/test_zeroize.gdb -nw -batch -nx 2>&1 | tee test_zeroize.log
+        if_build_succeeded [ -s test_zeroize.log ]
+        if_build_succeeded grep "The buffer was correctly zeroized" test_zeroize.log
+        if_build_succeeded not grep -i "error" test_zeroize.log
+        rm -f test_zeroize.log
     done
 done