diff --git a/src/rtapi/Submakefile b/src/rtapi/Submakefile
index bb36cc34260..31b210a0511 100644
--- a/src/rtapi/Submakefile
+++ b/src/rtapi/Submakefile
@@ -14,7 +14,7 @@ $(call TOOBJSDEPS, $(RTAPI_APP_SRCS)): EXTRAFLAGS += -DSIM \
 	-UULAPI -DRTAPI -pthread
 ../bin/rtapi_app: $(call TOOBJS, $(RTAPI_APP_SRCS))
 	$(ECHO) Linking $(notdir $@)
-	$(Q)$(CXX) -rdynamic -o $@ $^ $(LIBDL) -pthread -lrt -lfmt $(LIBUDEV_LIBS) -ldl -lcap $(LDFLAGS)
+	$(Q)$(CXX) -rdynamic -o $@ $^ $(LIBDL) -pthread -lrt -lfmt $(LIBUDEV_LIBS) -ldl -lcap -latomic $(LDFLAGS)
 TARGETS += ../bin/rtapi_app
 
 USPACE_POSIX_SRCS := rtapi/uspace_posix.cc