diff --git a/src/kernel/libroot/posix/signal/Jamfile b/src/kernel/libroot/posix/signal/Jamfile
index e7b61ee1e5..7d5f6a514b 100644
--- a/src/kernel/libroot/posix/signal/Jamfile
+++ b/src/kernel/libroot/posix/signal/Jamfile
@@ -5,6 +5,7 @@ KernelMergeObject posix_signal.o :
 	<$(SOURCE_GRIST)>send_signal.c
 	<$(SOURCE_GRIST)>sigaction.c
 	<$(SOURCE_GRIST)>signal.c
+	<$(SOURCE_GRIST)>sigprocmask.c
 	<$(SOURCE_GRIST)>sigset.c
 	<$(SOURCE_GRIST)>strsignal.c
 	:
diff --git a/src/kernel/libroot/posix/signal/sigprocmask.c b/src/kernel/libroot/posix/signal/sigprocmask.c
new file mode 100644
index 0000000000..536e852709
--- /dev/null
+++ b/src/kernel/libroot/posix/signal/sigprocmask.c
@@ -0,0 +1,20 @@
+/* 
+** Copyright 2004, Axel Dörfler, axeld@pinc-software.de. All rights reserved.
+** Distributed under the terms of the Haiku License.
+*/
+
+
+#include <syscalls.h>
+
+#include <signal.h>
+#include <stdio.h>
+
+
+int
+sigprocmask(int how, const sigset_t *set, sigset_t *oset)
+{
+	// ToDo: implement me!
+	fprintf(stderr, "sigprocmask(): NOT IMPLEMENTED\n");
+	return -1;
+}
+