diff --git a/esp8266/Makefile b/esp8266/Makefile
index 96f8d504c2..3ae6b20729 100644
--- a/esp8266/Makefile
+++ b/esp8266/Makefile
@@ -147,7 +147,7 @@ OBJ += $(addprefix $(BUILD)/, $(DRIVERS_SRC_C:.c=.o))
 #OBJ += $(BUILD)/pins_$(BOARD).o
 
 # List of sources for qstr extraction
-SRC_QSTR += $(SRC_C) $(EXTMOD_SRC_C) $(DRIVERS_SRC_C)
+SRC_QSTR += $(SRC_C) $(EXTMOD_SRC_C) $(LIB_SRC_C) $(DRIVERS_SRC_C)
 # Append any auto-generated sources that are needed by sources listed in SRC_QSTR
 SRC_QSTR_AUTO_DEPS +=