diff --git a/src/core/device.cu b/src/core/device.cu
index 9439137..bb7194b 100644
--- a/src/core/device.cu
+++ b/src/core/device.cu
@@ -799,7 +799,7 @@ mod(const int a, const int b)
     return r < 0 ? r + b : r;
 }
 
-static int
+static inline int
 get_neighbor(const int3 offset)
 {
     // The number of nodes is n^3 = m = num_processes
@@ -810,8 +810,8 @@ get_neighbor(const int3 offset)
     MPI_Comm_rank(MPI_COMM_WORLD, &pid);
     MPI_Comm_size(MPI_COMM_WORLD, &num_processes);
 
-    const int n = floor(cbrt(num_processes));
-    ERRCHK_ALWAYS(ceil(cbrt(num_processes)) == n);
+    const int n = (int)floor(cbrt((float)num_processes));
+    ERRCHK_ALWAYS(ceil(cbrt((float)num_processes)) == n);
     ERRCHK_ALWAYS(n * n * n == num_processes);
 
     return mod(pid + offset.x, n) + offset.y * n + offset.z * n * n;