diff --git a/src/CLASS2/angle_class2.cpp b/src/CLASS2/angle_class2.cpp
index 7a926f7856..0db607e8a9 100644
--- a/src/CLASS2/angle_class2.cpp
+++ b/src/CLASS2/angle_class2.cpp
@@ -154,7 +154,7 @@ void AngleClass2::compute(int eflag, int vflag)
     tk2 = bb_k[type] * dr2;
 
     f1[0] -= delx1*tk2/r1;
-    f1[2] -= dely1*tk2/r1;
+    f1[1] -= dely1*tk2/r1;
     f1[2] -= delz1*tk2/r1;
 
     f3[0] -= delx2*tk1/r2;
@@ -194,7 +194,7 @@ void AngleClass2::compute(int eflag, int vflag)
     b2 = ba_k2[type] * dtheta / r2;
 
     f1[0] -= vx11 + b1*delx1 + vx12;
-    f1[2] -= vy11 + b1*dely1 + vy12;
+    f1[1] -= vy11 + b1*dely1 + vy12;
     f1[2] -= vz11 + b1*delz1 + vz12;
 
     f3[0] -= vx21 + b2*delx2 + vx22;
diff --git a/src/compute_temp_sphere.cpp b/src/compute_temp_sphere.cpp
index 6ce412c18b..6d460fc22c 100644
--- a/src/compute_temp_sphere.cpp
+++ b/src/compute_temp_sphere.cpp
@@ -37,6 +37,9 @@ ComputeTempSphere::ComputeTempSphere(LAMMPS *lmp, int narg, char **arg) :
   if (narg != 3 && narg != 4)
     error->all("Illegal compute temp/sphere command");
 
+  if (!atom->omega_flag)
+    error->all("Compute temp/sphere requires atom attribute omega");
+
   scalar_flag = vector_flag = 1;
   size_vector = 6;
   extscalar = 0;