diff --git a/include/libopencm3/stm32/l1/syscfg.h b/include/libopencm3/stm32/l1/syscfg.h
index b2e4991d..d8ce0ae8 100644
--- a/include/libopencm3/stm32/l1/syscfg.h
+++ b/include/libopencm3/stm32/l1/syscfg.h
@@ -38,4 +38,7 @@
 
 #include <libopencm3/stm32/common/syscfg_common_l1f234.h>
 
+/** Enable internal USB pullup iff USB periph is not powered down */
+#define SYSCFG_PMC_USB_PU			(1<<0)
+
 #endif