diff --git a/project/pycompile.mk b/project/pycompile.mk
index c116f85..c1b59d2 100644
--- a/project/pycompile.mk
+++ b/project/pycompile.mk
@@ -10,6 +10,7 @@ PYCOMPILE_CONFIG_SRCS	 = $(CONFIG_DEFAULT_SRCS)
 PYCOMPILE_TAGS		+= $(PYCOMPILE_DIR)/tree.tag
 PYCOMPILE_TAGS		+= $(PYCOMPILE_DIR)/config.tag
 
+PYCOMPILE_CFLAGS	+= -std=c99
 PYCOMPILE_CFLAGS	+= -I$(PYCOMPILE_DIR)/build
 PYCOMPILE_CFLAGS	+= -I$(PROJECT_DIR)/profiles
 PYCOMPILE_CFLAGS	+= -I$(SOURCE_DIR)/Include