diff --git a/openmp/runtime/src/kmp.h b/openmp/runtime/src/kmp.h
--- a/openmp/runtime/src/kmp.h
+++ b/openmp/runtime/src/kmp.h
@@ -2142,14 +2142,17 @@
 // Compiler sends us this info:
 typedef struct kmp_depend_info {
   kmp_intptr_t base_addr;
-  size_t len;
   struct {
+    kmp_uint64 len : 61;
     bool in : 1;
     bool out : 1;
     bool mtx : 1;
   } flags;
 } kmp_depend_info_t;
 
+static_assert(sizeof(kmp_depend_info_t) <= 2 * sizeof(uint64_t),
+              "KMP depend info type is larger than expected");
+
 // Internal structures to work with task dependencies:
 struct kmp_depnode_list {
   kmp_depnode_t *node;
diff --git a/openmp/runtime/src/kmp_gsupport.cpp b/openmp/runtime/src/kmp_gsupport.cpp
--- a/openmp/runtime/src/kmp_gsupport.cpp
+++ b/openmp/runtime/src/kmp_gsupport.cpp
@@ -1182,7 +1182,7 @@
 
       for (size_t i = 0U; i < ndeps; i++) {
         dep_list[i].base_addr = (kmp_intptr_t)depend[2U + i];
-        dep_list[i].len = 0U;
+        dep_list[i].flags.len = 0U;
         dep_list[i].flags.in = 1;
         dep_list[i].flags.out = (i < nout);
       }