diff --git a/src/tests/system/kernel/cow_bug113_test.cpp b/src/tests/system/kernel/cow_bug113_test.cpp
index 4bdd0e3538..f5aacaf32e 100644
--- a/src/tests/system/kernel/cow_bug113_test.cpp
+++ b/src/tests/system/kernel/cow_bug113_test.cpp
@@ -1,4 +1,5 @@
 #include <stdio.h>
+#include <string.h>
 #include <sys/stat.h>
 #include <unistd.h>
 
diff --git a/src/tests/system/kernel/page_fault_cache_merge_test.cpp b/src/tests/system/kernel/page_fault_cache_merge_test.cpp
index 2d339cc973..d8b759fc97 100644
--- a/src/tests/system/kernel/page_fault_cache_merge_test.cpp
+++ b/src/tests/system/kernel/page_fault_cache_merge_test.cpp
@@ -1,6 +1,7 @@
 #include <errno.h>
 #include <stdio.h>
 #include <string.h>
+#include <stdlib.h>
 #include <sys/wait.h>
 #include <unistd.h>
 
diff --git a/src/tests/system/kernel/syscall_restart_test.cpp b/src/tests/system/kernel/syscall_restart_test.cpp
index 1b337bf1e1..49e3c1ac68 100644
--- a/src/tests/system/kernel/syscall_restart_test.cpp
+++ b/src/tests/system/kernel/syscall_restart_test.cpp
@@ -235,7 +235,8 @@ public:
 	virtual status_t Prepare()
 	{
 		fBytesRead = -1;
-		fFDs = (int[2]){-1, -1};
+		fFDs[0] = -1;
+		fFDs[1] = -1;
 
 		if (pipe(fFDs) != 0)
 			return errno;
@@ -288,7 +289,8 @@ public:
 	virtual status_t Prepare()
 	{
 		fBytesWritten = -1;
-		fFDs = (int[2]){-1, -1};
+		fFDs[0] = -1;
+		fFDs[1] = -1;
 
 		if (pipe(fFDs) != 0)
 			return errno;