Index: mlir/lib/ExecutionEngine/SparseUtils.cpp
===================================================================
--- mlir/lib/ExecutionEngine/SparseUtils.cpp
+++ mlir/lib/ExecutionEngine/SparseUtils.cpp
@@ -166,7 +166,7 @@
 // with the naming convention ${SPARSE_MATRIX0}, ${SPARSE_MATRIX1}, etc.
 extern "C" char *getSparseMatrix(uint64_t id) {
   char var[80];
-  sprintf(var, "SPARSE_MATRIX%lu", id);
+  sprintf(var, "SPARSE_MATRIX%llu", id);
   char *env = getenv(var);
   return env;
 }