diff --git a/doc/src/compute_fep.txt b/doc/src/compute_fep.txt
index 9241e5b5a83ecee9d6f2fe8ec65f2795ffd182ad..a46ab5b8d333233db5278394059964071998dc85 100644
--- a/doc/src/compute_fep.txt
+++ b/doc/src/compute_fep.txt
@@ -135,14 +135,14 @@ the meaning of these parameters:
 
 "born"_pair_born.html: a,b,c: type pairs:
 "buck"_pair_buck.html: a,c: type pairs:
-"buck/mdf"_pair_mdf.html: aparm,cparm: type pairs:
+"buck/mdf"_pair_mdf.html: a,c: type pairs:
 "coul/cut"_pair_coul.html: scale: type pairs:
 "coul/cut/soft"_pair_fep_soft.html: lambda: type pairs:
 "coul/long, coul/msm"_pair_coul.html: scale: type pairs:
 "coul/long/soft"_pair_fep_soft.html: scale, lambda: type pairs:
 "eam"_pair_eam.html: scale: type pairs:
 "gauss"_pair_gauss.html: a: type pairs:
-"lennard/mdf"_pair_mdf.html: aparm,bparm: type pairs:
+"lennard/mdf"_pair_mdf.html: a,b: type pairs:
 "lj/class2"_pair_class2.html: epsilon,sigma: type pairs:
 "lj/class2/coul/cut, lj/class2/coul/long"_pair_class2.html: epsilon,sigma: type pairs:
 "lj/cut"_pair_lj.html: epsilon,sigma: type pairs:
diff --git a/doc/src/fix_adapt_fep.txt b/doc/src/fix_adapt_fep.txt
index 8f94a1a38c9b54c3209dcb0827ecfdedb9155c9b..9a9255db06c9289ab5caa38c5c48c7ed5a5514cb 100644
--- a/doc/src/fix_adapt_fep.txt
+++ b/doc/src/fix_adapt_fep.txt
@@ -114,14 +114,14 @@ styles and their energy formulas for the meaning of these parameters:
 
 "born"_pair_born.html: a,b,c: type pairs:
 "buck"_pair_buck.html: a,c: type pairs:
-"buck/mdf"_pair_mdf.html: aparm,cparm: type pairs:
+"buck/mdf"_pair_mdf.html: a,c: type pairs:
 "coul/cut"_pair_coul.html: scale: type pairs:
 "coul/cut/soft"_pair_fep_soft.html: lambda: type pairs:
 "coul/long, coul/msm"_pair_coul.html: scale: type pairs:
 "coul/long/soft"_pair_fep_soft.html: scale, lambda: type pairs:
 "eam"_pair_eam.html: scale: type pairs:
 "gauss"_pair_gauss.html: a: type pairs:
-"lennard/mdf"_pair_mdf.html: aparm,bparm: type pairs:
+"lennard/mdf"_pair_mdf.html: a,b: type pairs:
 "lj/class2"_pair_class2.html: epsilon,sigma: type pairs:
 "lj/class2/coul/cut, lj/class2/coul/long"_pair_class2.html: epsilon,sigma: type pairs:
 "lj/cut"_pair_lj.html: epsilon,sigma: type pairs:
diff --git a/src/USER-MISC/pair_buck_mdf.cpp b/src/USER-MISC/pair_buck_mdf.cpp
index 61d32892fcf7b5282a3c4bdb475dde78e14e3afc..38de1c7c50a9b44532176393b665ab6f6b881e16 100644
--- a/src/USER-MISC/pair_buck_mdf.cpp
+++ b/src/USER-MISC/pair_buck_mdf.cpp
@@ -427,7 +427,7 @@ double PairBuckMDF::single(int /*i*/, int /*j*/, int itype, int jtype,
 void *PairBuckMDF::extract(const char *str, int &dim)
 {
   dim = 2;
-  if (strcmp(str,"aparm") == 0) return (void *) a;
-  if (strcmp(str,"cparm") == 0) return (void *) c;
+  if (strcmp(str,"a") == 0) return (void *) a;
+  if (strcmp(str,"c") == 0) return (void *) c;
   return NULL;
 }
diff --git a/src/USER-MISC/pair_lennard_mdf.cpp b/src/USER-MISC/pair_lennard_mdf.cpp
index 45d0da4d83e03d2bea53c7ab2ca62f57ede9c802..4bc2da23f8060285b3e7f5be0cfae03e766c9ed7 100644
--- a/src/USER-MISC/pair_lennard_mdf.cpp
+++ b/src/USER-MISC/pair_lennard_mdf.cpp
@@ -389,7 +389,7 @@ double PairLJ_AB_MDF::single(int /*i*/, int /*j*/, int itype, int jtype,
 void *PairLJ_AB_MDF::extract(const char *str, int &dim)
 {
   dim = 2;
-  if (strcmp(str,"aparm") == 0) return (void *) aparm;
-  if (strcmp(str,"bparm") == 0) return (void *) bparm;
+  if (strcmp(str,"a") == 0) return (void *) aparm;
+  if (strcmp(str,"b") == 0) return (void *) bparm;
   return NULL;
 }