diff --git a/scripts/firmware.mk b/scripts/firmware.mk
index 455beb1..b98dfa4 100644
--- a/scripts/firmware.mk
+++ b/scripts/firmware.mk
@@ -41,6 +41,7 @@ objects := $(addprefix $(out_dir)/,$(c_sources:%.c=%.o) $(cpp_sources:%.cpp=%.o)
 
 CFLAGS += -DFIRMWARE_VERSION=\"$(FIRMWARE_VERSION)\"
 CFLAGS += -DBUILD_PROFILE=\"$(PROFILE)\"
+CFLAGS += -std=c11
 LFLAGS = $(LFLAGS.$(ARCH))
 
 all: $(build_dir)/$(program_name).hex
diff --git a/src/sequencer.h b/src/sequencer.h
index e8e17c1..e0aaaf6 100644
--- a/src/sequencer.h
+++ b/src/sequencer.h
@@ -112,7 +112,7 @@ typedef struct
 #define GET_STEP_GATE(x) (GATE_MASK & (x))
 #define SET_STEP_GATE(x, value) ((x) = (RATCHET_MASK & (x)) | (value))
 
-STATIC_ASSERT(sizeof(step_t) == 8, step_t_is_wrong_size);
+_Static_assert(sizeof(step_t) == 8, "step_t is wrong size");
 
 typedef struct
 {