diff --git a/Amm.dat b/Amm.dat
index 1b06f4d3..c7169124 100644
--- a/Amm.dat
+++ b/Amm.dat
@@ -44,7 +44,7 @@ N(+5)       NO3-    0   NO3
 N(+3)       NO2-    0   NO2
 N(0)        N2      0   N
 #N(-3)      NH4+    0   NH4             14.0067
-Amm         AmmH+   0   Amm             17.031
+Amm         AmmH+   0   AmmH            17.031
 B           H3BO3   0   B               10.81
 P           PO4-3   2   P               30.9738
 F           F-      0   F               18.9984
diff --git a/phreeqc.dat b/phreeqc.dat
index f925376f..04fe478e 100644
--- a/phreeqc.dat
+++ b/phreeqc.dat
@@ -44,7 +44,7 @@ N(+5)       NO3-    0   N
 N(+3)       NO2-    0   N
 N(0)        N2      0   N
 N(-3)       NH4+    0   N               14.0067
-#Amm        AmmH+   0   Amm            17.031
+#Amm        AmmH+   0   AmmH            17.031
 B           H3BO3   0   B               10.81
 P           PO4-3   2   P               30.9738
 F           F-      0   F               18.9984
diff --git a/phreeqc_rates.dat b/phreeqc_rates.dat
index 280ee03c..50a5e0d4 100644
--- a/phreeqc_rates.dat
+++ b/phreeqc_rates.dat
@@ -44,7 +44,7 @@ N(+5)       NO3-    0   N
 N(+3)       NO2-    0   N
 N(0)        N2      0   N
 N(-3)       NH4+    0   N               14.0067
-#Amm         AmmH+   0   Amm            17.031
+#Amm         AmmH+   0   AmmH           17.031
 B           H3BO3   0   B               10.81
 P           PO4-3   2   P               30.9738
 F           F-      0   F               18.9984