diff --git a/src/adjmat/MatrixColumnSums.cpp b/src/adjmat/MatrixColumnSums.cpp
index a294cad9c89a2730176ada62c1a11dcfe68be507..4a7d62dc5bc1ce8fb568f1ec8dc0e73b7722ae19 100644
--- a/src/adjmat/MatrixColumnSums.cpp
+++ b/src/adjmat/MatrixColumnSums.cpp
@@ -76,7 +76,7 @@ PLUMED_REGISTER_ACTION(MatrixColumnSums,"COLUMNSUMS")
 
 void MatrixColumnSums::registerKeywords( Keywords& keys ) {
   ActionWithInputMatrix::registerKeywords( keys );
-  keys.use("ALT_MIN"); keys.use("LOWEST"); keys.use("HIGHEST"); keys.use("MEAN");
+  keys.use("ALT_MIN"); keys.use("LOWEST"); keys.use("HIGHEST");
   keys.use("MEAN"); keys.use("MIN"); keys.use("MAX"); keys.use("LESS_THAN");
   keys.use("MORE_THAN"); keys.use("BETWEEN"); keys.use("HISTOGRAM"); keys.use("MOMENTS");
 }
diff --git a/src/adjmat/MatrixRowSums.cpp b/src/adjmat/MatrixRowSums.cpp
index a85f36f2f245d76d3a0c75f9657c025893904b2f..fb60b8b31e25124e906fa25381d41e4412298963 100644
--- a/src/adjmat/MatrixRowSums.cpp
+++ b/src/adjmat/MatrixRowSums.cpp
@@ -76,7 +76,7 @@ PLUMED_REGISTER_ACTION(MatrixRowSums,"ROWSUMS")
 
 void MatrixRowSums::registerKeywords( Keywords& keys ) {
   ActionWithInputMatrix::registerKeywords( keys );
-  keys.use("ALT_MIN"); keys.use("LOWEST"); keys.use("HIGHEST"); keys.use("MEAN");
+  keys.use("ALT_MIN"); keys.use("LOWEST"); keys.use("HIGHEST");
   keys.use("MEAN"); keys.use("MIN"); keys.use("MAX"); keys.use("LESS_THAN");
   keys.use("MORE_THAN"); keys.use("BETWEEN"); keys.use("HISTOGRAM"); keys.use("MOMENTS");
 }
diff --git a/src/multicolvar/MultiColvarCombine.cpp b/src/multicolvar/MultiColvarCombine.cpp
index 833a9a89e60a344f727bbe4235a57788deb7ae44..607ed6437375c489aa26d62447ea4f96c55c152e 100644
--- a/src/multicolvar/MultiColvarCombine.cpp
+++ b/src/multicolvar/MultiColvarCombine.cpp
@@ -56,7 +56,7 @@ void MultiColvarCombine::registerKeywords( Keywords& keys ) {
   MultiColvarBase::registerKeywords( keys );
   keys.add("compulsory","DATA","the multicolvars you are calculating linear combinations for");
   keys.add("compulsory","COEFFICIENTS","1.0","the coeficients to use for the various multicolvars");
-  keys.use("MEAN"); keys.use("MORE_THAN"); keys.use("SUM"); keys.use("LESS_THAN"); keys.use("HISTOGRAM"); keys.use("HISTOGRAM");
+  keys.use("MEAN"); keys.use("MORE_THAN"); keys.use("SUM"); keys.use("LESS_THAN"); keys.use("HISTOGRAM");
   keys.use("MIN"); keys.use("MAX"); keys.use("LOWEST"); keys.use("HIGHEST"); keys.use("ALT_MIN"); keys.use("BETWEEN"); keys.use("MOMENTS");
 }
 
diff --git a/src/multicolvar/MultiColvarProduct.cpp b/src/multicolvar/MultiColvarProduct.cpp
index 18a0c1822dcfb8ad831fe083a71d22a5418fcb16..32748fed6bb5c7db33f92a7c7856826161f2896e 100644
--- a/src/multicolvar/MultiColvarProduct.cpp
+++ b/src/multicolvar/MultiColvarProduct.cpp
@@ -54,7 +54,7 @@ PLUMED_REGISTER_ACTION(MultiColvarProduct,"MCOLV_PRODUCT")
 void MultiColvarProduct::registerKeywords( Keywords& keys ) {
   MultiColvarBase::registerKeywords( keys );
   keys.add("compulsory","DATA","the multicolvars you are calculating the product of");
-  keys.use("MEAN"); keys.use("MORE_THAN"); keys.use("SUM"); keys.use("LESS_THAN"); keys.use("HISTOGRAM"); keys.use("HISTOGRAM");
+  keys.use("MEAN"); keys.use("MORE_THAN"); keys.use("SUM"); keys.use("LESS_THAN"); keys.use("HISTOGRAM");
   keys.use("MIN"); keys.use("MAX"); keys.use("LOWEST"); keys.use("HIGHEST"); keys.use("ALT_MIN"); keys.use("BETWEEN"); keys.use("MOMENTS");
 }