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-rw-r--r--ports/stm32/lwip_inc/arch/cc.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/ports/stm32/lwip_inc/arch/cc.h b/ports/stm32/lwip_inc/arch/cc.h
index 635b1c805..fc5230ef7 100644
--- a/ports/stm32/lwip_inc/arch/cc.h
+++ b/ports/stm32/lwip_inc/arch/cc.h
@@ -5,4 +5,6 @@
#define LWIP_PLATFORM_DIAG(x)
#define LWIP_PLATFORM_ASSERT(x) { assert(1); }
+#define LWIP_NO_CTYPE_H 1
+
#endif // MICROPY_INCLUDED_STM32_LWIP_ARCH_CC_H