diff --git a/src/crystallization/Gradient.cpp b/src/crystallization/Gradient.cpp
index dfa2d4659687d85503f969612bda30125f22582d..4bd4763a27ad234d39161e8d947db8b97535c41c 100644
--- a/src/crystallization/Gradient.cpp
+++ b/src/crystallization/Gradient.cpp
@@ -24,7 +24,7 @@
 #include "Gradient.h"
 
 namespace PLMD {
-namespace crystallisation {
+namespace crystallization {
 
 //+PLUMEDOC MCOLVARF GRADIENT
 /*
diff --git a/src/crystallization/Gradient.h b/src/crystallization/Gradient.h
index bb7304e3475dac8d738d803542238a01069fb317..bb3b81bd7b7baf636563bfb769099376914c89af 100644
--- a/src/crystallization/Gradient.h
+++ b/src/crystallization/Gradient.h
@@ -25,7 +25,7 @@
 #include "multicolvar/VolumeGradientBase.h"
 
 namespace PLMD {
-namespace crystallisation {
+namespace crystallization {
 
 class Gradient : public multicolvar::VolumeGradientBase {
 friend class GradientVessel;
diff --git a/src/crystallization/GradientVessel.cpp b/src/crystallization/GradientVessel.cpp
index 022735d2b84ec673ff402d1373ad56f8b25e6625..d1ad12fe9914003580e742e82d9aa3f7acf73fbf 100644
--- a/src/crystallization/GradientVessel.cpp
+++ b/src/crystallization/GradientVessel.cpp
@@ -27,7 +27,7 @@
 #include "Gradient.h"
 
 namespace PLMD {
-namespace crystallisation {
+namespace crystallization {
 
 class GradientVessel : public vesselbase::FunctionVessel {
 private:
diff --git a/src/crystallization/InterMolecularTorsions.cpp b/src/crystallization/InterMolecularTorsions.cpp
index 60abdb80841d74a96f467269b190e8b163a04111..15467d658153c012529edcffa29532734cd0f5d7 100644
--- a/src/crystallization/InterMolecularTorsions.cpp
+++ b/src/crystallization/InterMolecularTorsions.cpp
@@ -37,7 +37,7 @@ Calculate torsions between axis of adjacent molecules
 //+ENDPLUMEDOC
 
 namespace PLMD {
-namespace multicolvar {
+namespace crystallization {
 
 class InterMolecularTorsions : public MultiColvarFunction {
 private: