diff --git a/openmp/libomptarget/test/api/omp_get_num_procs.c b/openmp/libomptarget/test/api/omp_get_num_procs.c
index f58274b5e15e7..e958d0cf3492f 100644
--- a/openmp/libomptarget/test/api/omp_get_num_procs.c
+++ b/openmp/libomptarget/test/api/omp_get_num_procs.c
@@ -2,7 +2,7 @@
 
 #include <stdio.h>
 
-int omp_get_num_procs();
+int omp_get_num_procs(void);
 
 int main() {
   int num_procs;