diff --git a/tests/scripts/all.sh b/tests/scripts/all.sh
index 630ddfb..7466b54 100755
--- a/tests/scripts/all.sh
+++ b/tests/scripts/all.sh
@@ -447,10 +447,31 @@
 scripts/config.pl unset MBEDTLS_PADLOCK_C
 CC=gcc CFLAGS='-Werror -Wall -Wextra -DMBEDTLS_HAVE_INT32' make
 
-msg "test: gcc, force 32-bit compilation"
+msg "build: gcc, force 64-bit compilation"
+cleanup
+cp "$CONFIG_H" "$CONFIG_BAK"
+scripts/config.pl unset MBEDTLS_HAVE_ASM
+scripts/config.pl unset MBEDTLS_AESNI_C
+scripts/config.pl unset MBEDTLS_PADLOCK_C
+CC=gcc CFLAGS='-Werror -Wall -Wextra -DMBEDTLS_HAVE_INT64' make
+
+msg "test: gcc, force 64-bit compilation"
 make test
+
+msg "build: gcc, force 64-bit compilation, attempt to set MBEDTLS_TYPE_UDBL"
+cleanup
+cp "$CONFIG_H" "$CONFIG_BAK"
+scripts/config.pl unset MBEDTLS_HAVE_ASM
+scripts/config.pl unset MBEDTLS_AESNI_C
+scripts/config.pl unset MBEDTLS_PADLOCK_C
+CC=gcc CFLAGS='-Werror -Wall -Wextra -DMBEDTLS_HAVE_INT64 -DMBEDTLS_TYPE_UDBL="typedef XXXXXX"' make
 fi # x86_64
 
+msg "build: gcc, attempt to set MBEDTLS_TYPE_UDBL for known compiler"
+cleanup
+cp "$CONFIG_H" "$CONFIG_BAK"
+CC=gcc CFLAGS='-Werror -Wall -Wextra -DMBEDTLS_TYPE_UDBL="typedef XXXXXX"' make
+
 msg "build: arm-none-eabi-gcc, make" # ~ 10s
 cleanup
 cp "$CONFIG_H" "$CONFIG_BAK"