diff --git a/src/tests/system/libroot/posix/posixtestsuite/conformance/interfaces/pthread_key_create/speculative/5-1.c b/src/tests/system/libroot/posix/posixtestsuite/conformance/interfaces/pthread_key_create/speculative/5-1.c
index 6ff3d05529..cf39dea4ef 100644
--- a/src/tests/system/libroot/posix/posixtestsuite/conformance/interfaces/pthread_key_create/speculative/5-1.c
+++ b/src/tests/system/libroot/posix/posixtestsuite/conformance/interfaces/pthread_key_create/speculative/5-1.c
@@ -36,7 +36,7 @@
 
 int NUM_OF_KEYS = PTHREAD_KEYS_MAX;
 
-static pthread_key_t keys[5];
+static pthread_key_t keys[NUM_OF_KEYS];
 
 int main()
 {