diff --git a/doc/src/fix_adapt.rst b/doc/src/fix_adapt.rst
index 8fb103f5c6..f737fc750f 100644
--- a/doc/src/fix_adapt.rst
+++ b/doc/src/fix_adapt.rst
@@ -214,6 +214,8 @@ formulas for the meaning of these parameters:
 +------------------------------------------------------------------------------+--------------------------------------------------+-------------+
 | :doc:`lj/mdf <pair_mdf>`                                                     | epsilon,sigma                                    | type pairs  |
 +------------------------------------------------------------------------------+--------------------------------------------------+-------------+
+| :doc:`lj/pirani <pair_lj_pirani>`                                            | alpha, beta, gamma, rm, epsilon                  | type pairs  |
++------------------------------------------------------------------------------+--------------------------------------------------+-------------+
 | :doc:`lj/sf/dipole/sf <pair_dipole>`                                         | epsilon,sigma,scale                              | type pairs  |
 +------------------------------------------------------------------------------+--------------------------------------------------+-------------+
 | :doc:`lubricate <pair_lubricate>`                                            | mu                                               | global      |
diff --git a/src/EXTRA-PAIR/pair_lj_pirani.cpp b/src/EXTRA-PAIR/pair_lj_pirani.cpp
index 259355ecd9..b0b5ab2f7a 100644
--- a/src/EXTRA-PAIR/pair_lj_pirani.cpp
+++ b/src/EXTRA-PAIR/pair_lj_pirani.cpp
@@ -24,7 +24,6 @@
 #include "comm.h"
 #include "error.h"
 #include "force.h"
-#include "math_const.h"
 #include "math_special.h"
 #include "memory.h"
 #include "neigh_list.h"
@@ -36,7 +35,6 @@
 #include <cstring>
 
 using namespace LAMMPS_NS;
-using namespace MathConst;
 using MathSpecial::square;
 
 /* ---------------------------------------------------------------------- */
@@ -883,5 +881,8 @@ void *PairLJPirani::extract(const char *str, int &dim)
   dim = 2;
   if (strcmp(str, "alpha") == 0) return (void *) alpha;
   if (strcmp(str, "beta") == 0) return (void *) beta;
+  if (strcmp(str, "gamma") == 0) return (void *) gamma;
+  if (strcmp(str, "rm") == 0) return (void *) rm;
+  if (strcmp(str, "epsilon") == 0) return (void *) epsilon;
   return nullptr;
 }
diff --git a/unittest/force-styles/tests/mol-pair-lj_pirani.yaml b/unittest/force-styles/tests/mol-pair-lj_pirani.yaml
index df56942a8c..d745fd788b 100644
--- a/unittest/force-styles/tests/mol-pair-lj_pirani.yaml
+++ b/unittest/force-styles/tests/mol-pair-lj_pirani.yaml
@@ -28,7 +28,12 @@ pair_coeff: ! |
   4 4  3.0 12.0 7.0 3.1 0.015
   4 5  1.0 11.0 6.0 3.1 0.015
   5 5  1.0 10.0 6.0 3.1 0.015
-extract: ! ""
+extract: |
+  alpha 2
+  beta 2
+  gamma 2
+  rm 2
+  epsilon 2
 natoms: 29
 init_vdwl: 5331.956709045601
 init_coul: 0