diff --git a/src/kernel/libroot/posix/unistd/Jamfile b/src/kernel/libroot/posix/unistd/Jamfile
index c868819912..b0e7da586e 100644
--- a/src/kernel/libroot/posix/unistd/Jamfile
+++ b/src/kernel/libroot/posix/unistd/Jamfile
@@ -17,6 +17,7 @@ KernelMergeObject posix_unistd.o :
 	<$(SOURCE_GRIST)>mount.c
 	<$(SOURCE_GRIST)>open.c
 	<$(SOURCE_GRIST)>pipe.c
+	<$(SOURCE_GRIST)>process.c
 	<$(SOURCE_GRIST)>read.c
 	<$(SOURCE_GRIST)>sleep.c
 	<$(SOURCE_GRIST)>terminal.c
diff --git a/src/kernel/libroot/posix/unistd/process.c b/src/kernel/libroot/posix/unistd/process.c
index 828091f366..ba7309f2ef 100644
--- a/src/kernel/libroot/posix/unistd/process.c
+++ b/src/kernel/libroot/posix/unistd/process.c
@@ -10,6 +10,9 @@
 #include <errno.h>
 
 
+extern thread_id __main_thread_id;
+
+
 // ToDo: implement the process ID functions for real!
 
 
@@ -23,7 +26,8 @@ getpgrp(void)
 pid_t 
 getpid(void)
 {
-	return 0;
+	// this one returns the ID of the main thread
+	return __main_thread_id;
 }