diff --git a/lib/gpu/lal_lj_smooth.cpp b/lib/gpu/lal_lj_smooth.cpp
index 47ca4ab6fa..59ebd0f636 100644
--- a/lib/gpu/lal_lj_smooth.cpp
+++ b/lib/gpu/lal_lj_smooth.cpp
@@ -145,7 +145,7 @@ double LJSMOOTHT::host_memory_usage() const {
 // Calculate energies, forces, and torques
 // ---------------------------------------------------------------------------
 template <class numtyp, class acctyp>
-int LJSMOOTHT::loop(const bool _eflag, const bool _vflag) {
+int LJSMOOTHT::loop(const int _eflag, const int _vflag) {
   // Compute the block size and grid size to keep all cores busy
   const int BX=this->block_size();
   int eflag, vflag;