diff --git a/src/c/symbols_list.h b/src/c/symbols_list.h
index 770a99ed7..00966f495 100644
--- a/src/c/symbols_list.h
+++ b/src/c/symbols_list.h
@@ -1516,6 +1516,7 @@ cl_symbols[] = {
 {MP_ "+LOAD-COMPILE-LOCK+", MP_CONSTANT, NULL, -1, OBJNULL},
 {MP_ "WITH-LOCK", MP_CONSTANT, NULL, -1, OBJNULL},
 {MP_ "WITHOUT-INTERRUPTS", MP_CONSTANT, NULL, -1, OBJNULL},
+{MP_ "CHECK-PENDING-INTERRUPTS", SI_ORDINARY, si_check_pending_interrupts, 0, OBJNULL},
 #endif
 
 {SYS_ "WHILE", SI_ORDINARY, NULL, -1, OBJNULL},
diff --git a/src/c/symbols_list2.h b/src/c/symbols_list2.h
index 9649f1b53..b5e2c4b19 100644
--- a/src/c/symbols_list2.h
+++ b/src/c/symbols_list2.h
@@ -1516,6 +1516,7 @@ cl_symbols[] = {
 {MP_ "+LOAD-COMPILE-LOCK+",NULL},
 {MP_ "WITH-LOCK",NULL},
 {MP_ "WITHOUT-INTERRUPTS",NULL},
+{MP_ "CHECK-PENDING-INTERRUPTS","si_check_pending_interrupts"},
 #endif
 
 {SYS_ "WHILE",NULL},
diff --git a/src/c/unixint.d b/src/c/unixint.d
index 8e6a0117a..258e8e529 100644
--- a/src/c/unixint.d
+++ b/src/c/unixint.d
@@ -172,11 +172,13 @@ si_check_pending_interrupts(void)
 {
 	int what = cl_env.interrupt_pending;
 	cl_env.interrupt_pending = 0;
+	if (what) {
 #if defined (HAVE_SIGPROCMASK) && defined(SA_SIGINFO)
-	handle_signal(what, 0, 0);
+		handle_signal(what, 0, 0);
 #else
-	handle_signal(what);
+		handle_signal(what);
 #endif
+	}
 	@(return)
 }