diff --git a/tests/scripts/all.sh b/tests/scripts/all.sh
index 4bfb1aa..d075926 100755
--- a/tests/scripts/all.sh
+++ b/tests/scripts/all.sh
@@ -3894,7 +3894,7 @@
 
     make clean
 
-    # Compile with -O1 since some Arm inline assembly is disabled for -O0.
+    # Compile mostly with -O1 since some Arm inline assembly is disabled for -O0.
 
     # ARM Compiler 6 - Target ARMv7-A
     armc6_build_test "-O1 --target=arm-arm-none-eabi -march=armv7-a"
@@ -3914,6 +3914,9 @@
     # ARM Compiler 6 - Target ARMv8.2-A - AArch64
     armc6_build_test "-O1 --target=aarch64-arm-none-eabi -march=armv8.2-a+crypto"
 
+    # ARM Compiler 6 - Target Cortex-M0 - no optimisation
+    armc6_build_test "-O0 --target=arm-arm-none-eabi -mcpu=cortex-m0"
+
     # ARM Compiler 6 - Target Cortex-M0
     armc6_build_test "-Os --target=arm-arm-none-eabi -mcpu=cortex-m0"
 }