diff --git a/runtime/tests/sockserver/server.c b/runtime/tests/sockserver/server.c
index 3733187..0a68b09 100644
--- a/runtime/tests/sockserver/server.c
+++ b/runtime/tests/sockserver/server.c
@@ -2,8 +2,11 @@
    The port number is passed as an argument */
 /* code from: http://www.cs.rpi.edu/~moorthy/Courses/os98/Pgms/socket.html */
 #include <stdio.h>
+#include <stdlib.h>
+#include <strings.h>
 #include <sys/types.h>
 #include <sys/socket.h>
+#include <unistd.h>
 #include <netinet/in.h>
 
 void
diff --git a/runtime/tests/work/main.c b/runtime/tests/work/main.c
index bf42a16..600dca3 100644
--- a/runtime/tests/work/main.c
+++ b/runtime/tests/work/main.c
@@ -1,6 +1,7 @@
 #include <stdlib.h>
 #include <stdio.h>
 #include <string.h>
+#include <unistd.h>
 
 #ifndef MAX_BUF
 #define MAX_BUF (1024 * 1024 * 1) // 1m
diff --git a/runtime/tests/work100k/main.c b/runtime/tests/work100k/main.c
index dd9cfa7..0ed61e3 100644
--- a/runtime/tests/work100k/main.c
+++ b/runtime/tests/work100k/main.c
@@ -1,6 +1,7 @@
 #include <stdlib.h>
 #include <stdio.h>
 #include <string.h>
+#include <unistd.h>
 
 #define MAX_BUF 102400
 
diff --git a/runtime/tests/work10k/main.c b/runtime/tests/work10k/main.c
index f456ccc..63e8978 100644
--- a/runtime/tests/work10k/main.c
+++ b/runtime/tests/work10k/main.c
@@ -1,6 +1,7 @@
 #include <stdlib.h>
 #include <stdio.h>
 #include <string.h>
+#include <unistd.h>
 
 #define MAX_BUF 10240
 
diff --git a/runtime/tests/work1k/main.c b/runtime/tests/work1k/main.c
index 1c76d4d..f6c6c95 100644
--- a/runtime/tests/work1k/main.c
+++ b/runtime/tests/work1k/main.c
@@ -1,6 +1,7 @@
 #include <stdlib.h>
 #include <stdio.h>
 #include <string.h>
+#include <unistd.h>
 
 #define MAX_BUF 1024
 
diff --git a/runtime/tests/work1m/main.c b/runtime/tests/work1m/main.c
index 0c40471..5ba8371 100644
--- a/runtime/tests/work1m/main.c
+++ b/runtime/tests/work1m/main.c
@@ -1,6 +1,7 @@
 #include <stdlib.h>
 #include <stdio.h>
 #include <string.h>
+#include <unistd.h>
 
 #define MAX_BUF (1024 * 1024 * 1) // 1m