diff --git a/package/tinydtls/tinydtls.mk b/package/tinydtls/tinydtls.mk
index 90796b1487..fe250014ca 100644
--- a/package/tinydtls/tinydtls.mk
+++ b/package/tinydtls/tinydtls.mk
@@ -11,5 +11,7 @@ TINYDTLS_LICENSE = MIT
 TINYDTLS_LICENSE_FILES = tinydtls.h
 TINYDTLS_INSTALL_STAGING = YES
 TINYDTLS_STRIP_COMPONENTS = 2
+# use inttypes.h data types instead of u_intXX_t for musl compatibility
+TINYDTLS_CONF_ENV += CFLAGS="$(TARGET_CFLAGS) -DSHA2_USE_INTTYPES_H"
 
 $(eval $(autotools-package))