diff --git a/openmp/runtime/src/include/omp.h.var b/openmp/runtime/src/include/omp.h.var
index f372402be37d3..0dd3a533a3650 100644
--- a/openmp/runtime/src/include/omp.h.var
+++ b/openmp/runtime/src/include/omp.h.var
@@ -502,7 +502,7 @@
     extern int __KAI_KMPC_CONVENTION omp_in_explicit_task(void);
 
     /* LLVM Extensions */
-    extern void *llvm_omp_target_dynamic_shared_alloc();
+    extern void *llvm_omp_target_dynamic_shared_alloc(void);
 
 #   undef __KAI_KMPC_CONVENTION
 #   undef __KMP_IMP