diff --git a/tests/scripts/all.sh b/tests/scripts/all.sh
index 3eba418..da96040 100755
--- a/tests/scripts/all.sh
+++ b/tests/scripts/all.sh
@@ -2849,7 +2849,7 @@
 component_test_aes_fewer_tables () {
     msg "build: default config with AES_FEWER_TABLES enabled"
     scripts/config.py set MBEDTLS_AES_FEWER_TABLES
-    make CFLAGS='-Werror -Wall -Wextra'
+    make CFLAGS='-O2 -Werror -Wall -Wextra'
 
     msg "test: AES_FEWER_TABLES"
     make test
@@ -2858,7 +2858,7 @@
 component_test_aes_rom_tables () {
     msg "build: default config with AES_ROM_TABLES enabled"
     scripts/config.py set MBEDTLS_AES_ROM_TABLES
-    make CFLAGS='-Werror -Wall -Wextra'
+    make CFLAGS='-O2 -Werror -Wall -Wextra'
 
     msg "test: AES_ROM_TABLES"
     make test
@@ -2868,7 +2868,7 @@
     msg "build: default config with AES_ROM_TABLES and AES_FEWER_TABLES enabled"
     scripts/config.py set MBEDTLS_AES_FEWER_TABLES
     scripts/config.py set MBEDTLS_AES_ROM_TABLES
-    make CFLAGS='-Werror -Wall -Wextra'
+    make CFLAGS='-O2 -Werror -Wall -Wextra'
 
     msg "test: AES_FEWER_TABLES + AES_ROM_TABLES"
     make test
@@ -3103,7 +3103,7 @@
 component_test_mx32 () {
     msg "build: 64-bit ILP32, make, gcc" # ~ 30s
     scripts/config.py full
-    make CC=gcc CFLAGS='-Werror -Wall -Wextra -mx32' LDFLAGS='-mx32'
+    make CC=gcc CFLAGS='-O2 -Werror -Wall -Wextra -mx32' LDFLAGS='-mx32'
 
     msg "test: 64-bit ILP32, make, gcc"
     make test
@@ -3130,7 +3130,7 @@
     scripts/config.py unset MBEDTLS_HAVE_ASM
     scripts/config.py unset MBEDTLS_AESNI_C
     scripts/config.py unset MBEDTLS_PADLOCK_C
-    make CC=gcc CFLAGS='-Werror -Wall -Wextra -DMBEDTLS_HAVE_INT32'
+    make CC=gcc CFLAGS='-O2 -Werror -Wall -Wextra -DMBEDTLS_HAVE_INT32'
 
     msg "test: gcc, force 32-bit bignum limbs"
     make test
@@ -3141,7 +3141,7 @@
     scripts/config.py unset MBEDTLS_HAVE_ASM
     scripts/config.py unset MBEDTLS_AESNI_C
     scripts/config.py unset MBEDTLS_PADLOCK_C
-    make CC=gcc CFLAGS='-Werror -Wall -Wextra -DMBEDTLS_HAVE_INT64'
+    make CC=gcc CFLAGS='-O2 -Werror -Wall -Wextra -DMBEDTLS_HAVE_INT64'
 
     msg "test: gcc, force 64-bit bignum limbs"
     make test