diff --git a/libusb/Makefile.am b/libusb/Makefile.am
index db65d53..13c9d35 100644
--- a/libusb/Makefile.am
+++ b/libusb/Makefile.am
@@ -3,7 +3,7 @@ AM_CPPFLAGS = -I$(top_srcdir)/hidapi $(CFLAGS_LIBUSB)
 if OS_LINUX
 lib_LTLIBRARIES = libhidapi-libusb.la
 libhidapi_libusb_la_SOURCES = hid.c
-libhidapi_libusb_la_LDFLAGS = $(LTLDFLAGS)
+libhidapi_libusb_la_LDFLAGS = $(LTLDFLAGS) $(PTHREAD_CFLAGS)
 libhidapi_libusb_la_LIBADD = $(LIBS_LIBUSB)
 endif