diff --git a/src/port/linux.h b/src/port/linux.h
index 14396979bbce882011022667045c6c0760039fa7..f0e56d3dbab3a641c1815669e0cafe2b9689195f 100644
--- a/src/port/linux.h
+++ b/src/port/linux.h
@@ -6,6 +6,7 @@
 */
 #  define JMP_BUF
 #  define USE_POSIX_TIME
+#  define USE_POSIX_SIGNAL
 #  if !defined(PPC)
 #    define NEED_I386_TAS_ASM
 #    define HAS_TEST_AND_SET