diff --git a/src/SPIN/fix_precession_spin.cpp b/src/SPIN/fix_precession_spin.cpp
index 7cfbe6e1a7..389ab1838d 100644
--- a/src/SPIN/fix_precession_spin.cpp
+++ b/src/SPIN/fix_precession_spin.cpp
@@ -271,7 +271,7 @@ void FixPrecessionSpin::init()
   k2ch = k2c/hbar;
   K6h = K6/hbar;
 
-  if (strstr(update->integrate_style,"respa")) {
+  if (utils::strmatch(update->integrate_style,"^respa")) {
     ilevel_respa = ((Respa *) update->integrate)->nlevels-1;
     if (respa_level >= 0) ilevel_respa = MIN(respa_level,ilevel_respa);
   }
@@ -301,7 +301,7 @@ void FixPrecessionSpin::init()
 
 void FixPrecessionSpin::setup(int vflag)
 {
-  if (strstr(update->integrate_style,"verlet"))
+  if (utils::strmatch(update->integrate_style,"^verlet"))
     post_force(vflag);
   else {
     ((Respa *) update->integrate)->copy_flevel_f(ilevel_respa);