diff --git a/c/src/tests/psxtests/psx02/system.h b/c/src/tests/psxtests/psx02/system.h
index 2d0d07b32c..765abc2766 100644
--- a/c/src/tests/psxtests/psx02/system.h
+++ b/c/src/tests/psxtests/psx02/system.h
@@ -17,6 +17,7 @@
 /* functions */
 
 #include <pmacros.h>
+#include <errno.h>
 
 void *POSIX_Init(
   void *argument
diff --git a/testsuites/psxtests/psx02/system.h b/testsuites/psxtests/psx02/system.h
index 2d0d07b32c..765abc2766 100644
--- a/testsuites/psxtests/psx02/system.h
+++ b/testsuites/psxtests/psx02/system.h
@@ -17,6 +17,7 @@
 /* functions */
 
 #include <pmacros.h>
+#include <errno.h>
 
 void *POSIX_Init(
   void *argument