diff --git a/ports/minimal/Makefile b/ports/minimal/Makefile
index e97fb16d8d..64ad3cc0b2 100644
--- a/ports/minimal/Makefile
+++ b/ports/minimal/Makefile
@@ -41,6 +41,7 @@ LIBS =
 SRC_C = \
 	main.c \
 	uart_core.c \
+	lib/utils/printf.c \
 	lib/utils/stdout_helpers.c \
 	lib/utils/pyexec.c \
 	lib/libc/string0.c \