diff --git a/openmp/libomptarget/src/api.cpp b/openmp/libomptarget/src/api.cpp
--- a/openmp/libomptarget/src/api.cpp
+++ b/openmp/libomptarget/src/api.cpp
@@ -136,7 +136,12 @@
       "src offset %zu, length %zu\n", dst_device, src_device, DPxPTR(dst),
       DPxPTR(src), dst_offset, src_offset, length);
 
-  if (!dst || !src || length <= 0) {
+  if (length == 0) {
+    DP("Call to omp_target_memcpy with zero length, nothing to do\n");
+    return OFFLOAD_SUCCESS;
+  }
+
+  if (!dst || !src || length < 0) {
     REPORT("Call to omp_target_memcpy with invalid arguments\n");
     return OFFLOAD_FAIL;
   }