diff --git a/src/reader.h b/src/reader.h
index 4b75c953cc..541fa7a8d9 100644
--- a/src/reader.h
+++ b/src/reader.h
@@ -22,7 +22,7 @@ namespace LAMMPS_NS {
 
 class Reader : protected Pointers {
  public:
-  enum { ID, TYPE, X, Y, Z, VX, VY, VZ, Q, APIP_LAMBDA, IX, IY, IZ, FX, FY, FZ };
+  enum { ID, TYPE, X, Y, Z, VX, VY, VZ, Q, IX, IY, IZ, FX, FY, FZ, APIP_LAMBDA };
   enum { UNSET, NOSCALE_NOWRAP, NOSCALE_WRAP, SCALE_NOWRAP, SCALE_WRAP };
 
   Reader(class LAMMPS *);
diff --git a/src/reader_native.cpp b/src/reader_native.cpp
index 840813dab3..567f37a0a0 100644
--- a/src/reader_native.cpp
+++ b/src/reader_native.cpp
@@ -413,15 +413,15 @@ bigint ReaderNative::read_header(double box[3][3], int &boxinfo, int &triclinic,
     else if (fieldtype[i] == Q)
       fieldindex[i] = find_label("q", labels);
 
-    else if (fieldtype[i] == APIP_LAMBDA)
-      fieldindex[i] = find_label("apip_lambda", labels);
-
     else if (fieldtype[i] == IX)
       fieldindex[i] = find_label("ix", labels);
     else if (fieldtype[i] == IY)
       fieldindex[i] = find_label("iy", labels);
     else if (fieldtype[i] == IZ)
       fieldindex[i] = find_label("iz", labels);
+
+    else if (fieldtype[i] == APIP_LAMBDA)
+      fieldindex[i] = find_label("apip_lambda", labels);
   }
 
   // set fieldflag = -1 if any unfound fields