Index: test/python_api/value_var_update/Makefile
===================================================================
--- test/python_api/value_var_update/Makefile
+++ test/python_api/value_var_update/Makefile
@@ -1,6 +1,7 @@
 LEVEL = ../../make
 
 C_SOURCES := main.c
+CFLAGS_EXTRAS := -std=c99
 # See TestHelloWorld.py, which specifies the executable name with a dictionary.
 EXE := hello_world