Index: libomptarget/deviceRTLs/nvptx/src/libcall.cu
===================================================================
--- libomptarget/deviceRTLs/nvptx/src/libcall.cu
+++ libomptarget/deviceRTLs/nvptx/src/libcall.cu
@@ -101,18 +101,13 @@
 }
 
 EXTERN int omp_in_parallel(void) {
-  int rc = 0;
-  if (isRuntimeUninitialized()) {
-    ASSERT0(LT_FUSSY, isSPMDMode(),
-            "Expected SPMD mode only with uninitialized runtime.");
-    rc = 1;  // SPMD mode is always in parallel.
-  } else {
-    omptarget_nvptx_TaskDescr *currTaskDescr =
-        getMyTopTaskDescriptor(isSPMDMode());
-    if (currTaskDescr->InParallelRegion()) {
-      rc = 1;
-    }
-  }
+  // The effect of the omp_in_parallel routine is to return true if the current
+  // task is enclosed by an active parallel region, and the parallel region is
+  // enclosed by the outermost initial task region on the device; otherwise it
+  // returns false.
+  // Active parallel region - A parallel region that is executed by a team
+  // consisting of more than one thread.
+  int rc = omp_get_num_threads() > 1 ? 1 : 0;
   PRINT(LD_IO, "call omp_in_parallel() returns %d\n", rc);
   return rc;
 }
Index: libomptarget/deviceRTLs/nvptx/test/parallel/nested.c
===================================================================
--- libomptarget/deviceRTLs/nvptx/test/parallel/nested.c
+++ libomptarget/deviceRTLs/nvptx/test/parallel/nested.c
@@ -29,7 +29,7 @@
       // Expecting serialized parallel region.
       #pragma omp parallel
       {
-        // Expected to be 1.
+        // Expected to be 0.
         int nestedInParallel = omp_in_parallel();
         // Expected to be 1.
         int nestedNumThreads = omp_get_num_threads();
@@ -60,8 +60,8 @@
 
     // Check serialized parallel region.
     if (i < NumThreads) {
-      if (check2[i] != 2) {
-        printf("invalid: check2[%d] should be 2, is %d\n", i, check2[i]);
+      if (check2[i] != 1) {
+        printf("invalid: check2[%d] should be 1, is %d\n", i, check2[i]);
       }
     } else if (check2[i] != 0) {
       printf("invalid: check2[%d] should be 0, is %d\n", i, check2[i]);