diff --git a/include/IPhreeqc.f.inc b/include/IPhreeqc.f.inc
index 1f44f6e6..01063379 100644
--- a/include/IPhreeqc.f.inc
+++ b/include/IPhreeqc.f.inc
@@ -48,15 +48,15 @@ C
       INTEGER(KIND=4) GetComponentCount
       INTEGER(KIND=4) GetDumpLine
       INTEGER(KIND=4) GetDumpLineCount
-      INTEGER(KIND=4) GetDumpOn
-      INTEGER(KIND=4) GetDumpStringOn
+      LOGICAL(KIND=4) GetDumpOn
+      LOGICAL(KIND=4) GetDumpStringOn
       INTEGER(KIND=4) GetErrorLine
       INTEGER(KIND=4) GetErrorLineCount
-      INTEGER(KIND=4) GetErrorOn
-      INTEGER(KIND=4) GetLogOn
+      LOGICAL(KIND=4) GetErrorOn
+      LOGICAL(KIND=4) GetLogOn
       LOGICAL(KIND=4) GetOutputOn
       INTEGER(KIND=4) GetSelectedOutputColumnCount
-      INTEGER(KIND=4) GetSelectedOutputOn
+      LOGICAL(KIND=4) GetSelectedOutputOn
       INTEGER(KIND=4) GetSelectedOutputRowCount
       INTEGER(KIND=4) GetSelectedOutputValue
       INTEGER(KIND=4) GetWarningLine