diff --git a/c/src/tests/psxtests/psx06/system.h b/c/src/tests/psxtests/psx06/system.h
index 434bde09e3..f6527b5516 100644
--- a/c/src/tests/psxtests/psx06/system.h
+++ b/c/src/tests/psxtests/psx06/system.h
@@ -39,7 +39,7 @@ void *Task_2(
 
 #define CONFIGURE_POSIX_INIT_THREAD_TABLE
 
-#define CONFIGURE_MAXIMUM_POSIX_KEYS     10
+#define CONFIGURE_MAXIMUM_POSIX_KEYS     1
 
 #include <confdefs.h>
 
diff --git a/testsuites/psxtests/psx06/system.h b/testsuites/psxtests/psx06/system.h
index 434bde09e3..f6527b5516 100644
--- a/testsuites/psxtests/psx06/system.h
+++ b/testsuites/psxtests/psx06/system.h
@@ -39,7 +39,7 @@ void *Task_2(
 
 #define CONFIGURE_POSIX_INIT_THREAD_TABLE
 
-#define CONFIGURE_MAXIMUM_POSIX_KEYS     10
+#define CONFIGURE_MAXIMUM_POSIX_KEYS     1
 
 #include <confdefs.h>