diff --git a/python/_project.pyx b/python/_project.pyx
index 0906474..1261c65 100644
--- a/python/_project.pyx
+++ b/python/_project.pyx
@@ -108,13 +108,6 @@ cdef int ngp3d_INTERNAL_periodic(DTYPE_t x, DTYPE_t y,
     iy = iy%Ngrid
     iz = iz%Ngrid
 
-    if (ix < 0)  or (jx >= Ngrid):
-      return -1
-    if (iy < 0)  or (jy >= Ngrid):
-      return -2
-    if (iz < 0)  or (jz >= Ngrid):
-      return -3
-
     retval[0] = d[ix ,iy ,iz ] 
 
     return 0
@@ -141,11 +134,11 @@ cdef int ngp3d_INTERNAL(DTYPE_t x, DTYPE_t y,
     iy = int(floor(ry))
     iz = int(floor(rz))
 
-    if (ix < 0)  or (jx >= Ngrid):
+    if (ix < 0 or ix >= Ngrid):
       return -1
-    if (iy < 0)  or (jy >= Ngrid):
+    if (iy < 0 or iy >= Ngrid):
       return -2
-    if (iz < 0)  or (jz >= Ngrid):
+    if (iz < 0 or iz >= Ngrid):
       return -3
 
     retval[0] = d[ix ,iy ,iz ]