diff --git a/include/IPhreeqc.h b/include/IPhreeqc.h
index cf40d234..036b6b01 100644
--- a/include/IPhreeqc.h
+++ b/include/IPhreeqc.h
@@ -667,7 +667,7 @@ Headings
  *    INTEGER(KIND=4),   INTENT(IN)   :: ROW
  *    INTEGER(KIND=4),   INTENT(IN)   :: COL
  *    INTEGER(KIND=4),   INTENT(OUT)  :: VTYPE
- *    REAL*8,            INTENT(OUT)  :: DVALUE
+ *    REAL(KIND=8),      INTENT(OUT)  :: DVALUE
  *    CHARACTER(LEN=*),  INTENT(OUT)  :: SVALUE
  *    INTEGER(KIND=4)                 :: GetSelectedOutputValue
  *  END FUNCTION GetSelectedOutputValue