diff --git a/fortran/Makefile b/fortran/Makefile
index e78f305..0c45fd8 100644
--- a/fortran/Makefile
+++ b/fortran/Makefile
@@ -7,19 +7,19 @@
 #            generator in the code. Use gfortran which is now
 #            a standard part of gcc in moder systems.
 #
-FC=gfortran
-#DEBUG = -g -O -fbacktrace -ffpe-trap='underflow'
-DEBUG =
-#WARN= -Wall -W
-WARN= 
-DIALECT =
+
+FC = gfortran
+DEBUG = # -g -O -fbacktrace -ffpe-trap='underflow'
+WARN = # -Wall -Wextra
+DIALECT = -std=gnu
 prefix = /usr/local
-OPS=-c $(DIALECT) $(WARN) $(DEBUG)
+# OPS = -c $(DIALECT) $(WARN) $(DEBUG)
+FCFLAGS = $(DIALECT) $(WARN) $(DEBUG) -O3 -mcmodel=medium
 
 all : trimspNL
 
 trimspNL : trimspNL.F
-	$(FC) -O3 -o $@ $< 
+	$(FC) $(FCFLAGS) -o $@ $<
 
 clean:
 	rm -f *.o *~ \#* .#* trimspNL
diff --git a/fortran/trimspNL.F b/fortran/trimspNL.F
index 50067f9..54cf15b 100644
--- a/fortran/trimspNL.F
+++ b/fortran/trimspNL.F
@@ -53,7 +53,7 @@ C     and maximum number of points in the depth distribution MAXD
 C     This is the only point where the number of layers and depth
 C     profile are changed. All other parameters shouold be changed
 C     accordingly.
-      PARAMETER (MAXD=500)
+      PARAMETER (MAXD=10000)
       PARAMETER (MAXNL=100)
       PARAMETER (MAXD1=MAXD+1)
       PARAMETER (MAXD2=MAXD+2)