diff --git a/src/dihedral_hybrid.cpp b/src/dihedral_hybrid.cpp
index 48d879d435..752b1818a5 100644
--- a/src/dihedral_hybrid.cpp
+++ b/src/dihedral_hybrid.cpp
@@ -286,6 +286,16 @@ void DihedralHybrid::coeff(int narg, char **arg)
   if (m == nstyles) {
     if (strcmp(arg[1],"none") == 0) none = 1;
     else if (strcmp(arg[1],"skip") == 0) none = skip = 1;
+    else if (strcmp(arg[1],"mbt") == 0)
+      error->all(FLERR,"MiddleBondTorsion coeff for hybrid dihedral has invalid format");
+    else if (strcmp(arg[1],"ebt") == 0)
+      error->all(FLERR,"EndBondTorsion coeff for hybrid dihedral has invalid format");
+    else if (strcmp(arg[1],"at") == 0)
+      error->all(FLERR,"AngleTorsion coeff for hybrid dihedral has invalid format");
+    else if (strcmp(arg[1],"aat") == 0)
+      error->all(FLERR,"AngleAngleTorsion coeff for hybrid dihedral has invalid format");
+    else if (strcmp(arg[1],"bb13") == 0)
+      error->all(FLERR,"BondBond13 coeff for hybrid dihedral has invalid format");
     else error->all(FLERR,"Dihedral coeff for hybrid has invalid style");
   }
 
diff --git a/src/improper_hybrid.cpp b/src/improper_hybrid.cpp
index ed1a8075a9..ffee2e2fc8 100644
--- a/src/improper_hybrid.cpp
+++ b/src/improper_hybrid.cpp
@@ -283,15 +283,19 @@ void ImproperHybrid::coeff(int narg, char **arg)
   utils::bounds(FLERR,arg[0],1,atom->nimpropertypes,ilo,ihi,error);
 
   // 2nd arg = improper sub-style name
-  // allow for "none" as valid sub-style name
+  // allow for "none" or "skip" as valid sub-style name
 
   int m;
   for (m = 0; m < nstyles; m++)
     if (strcmp(arg[1],keywords[m]) == 0) break;
 
   int none = 0;
+  int skip = 0;
   if (m == nstyles) {
     if (strcmp(arg[1],"none") == 0) none = 1;
+    else if (strcmp(arg[1],"skip") == 0) none = skip = 1;
+    else if (strcmp(arg[1],"aa") == 0)
+      error->all(FLERR,"AngleAngle coeff for hybrid improper has invalid format");
     else error->all(FLERR,"Improper coeff for hybrid has invalid style");
   }