diff --git a/lib/libspl/Makefile.am b/lib/libspl/Makefile.am
index eb2377305aca..94be416d46aa 100644
--- a/lib/libspl/Makefile.am
+++ b/lib/libspl/Makefile.am
@@ -1,47 +1,51 @@
 include $(srcdir)/%D%/include/Makefile.am
 
 libspl_assert_la_CFLAGS = $(AM_CFLAGS) $(LIBRARY_CFLAGS) $(LIBUNWIND_CFLAGS)
 libspl_la_CFLAGS        = $(libspl_assert_la_CFLAGS)
 
 noinst_LTLIBRARIES += libspl_assert.la libspl.la
 CPPCHECKTARGETS    += libspl_assert.la libspl.la
 
 libspl_assert_la_SOURCES = \
 	%D%/assert.c
 
 libspl_la_SOURCES = \
 	%D%/libspl_impl.h \
 	%D%/atomic.c \
 	%D%/getexecname.c \
 	%D%/list.c \
 	%D%/mkdirp.c \
 	%D%/page.c \
 	%D%/strlcat.c \
 	%D%/strlcpy.c \
 	%D%/timestamp.c \
 	%D%/include/sys/list.h \
 	%D%/include/sys/list_impl.h
 
 if BUILD_LINUX
 libspl_la_SOURCES += \
 	%D%/os/linux/getexecname.c \
 	%D%/os/linux/gethostid.c \
 	%D%/os/linux/getmntany.c \
 	%D%/os/linux/zone.c
 endif
 
 if BUILD_FREEBSD
 libspl_la_SOURCES += \
 	%D%/os/freebsd/getexecname.c \
 	%D%/os/freebsd/gethostid.c \
 	%D%/os/freebsd/getmntany.c \
 	%D%/os/freebsd/mnttab.c \
 	%D%/os/freebsd/zone.c
 endif
 
 libspl_la_LIBADD = \
 	libspl_assert.la
 
 libspl_la_LIBADD += $(LIBATOMIC_LIBS) $(LIBCLOCK_GETTIME)
 
 libspl_assert_la_LIBADD = $(BACKTRACE_LIBS) $(LIBUNWIND_LIBS)
+
+if BUILD_FREEBSD
+libspl_assert_la_LIBADD += -lpthread
+endif