diff --git a/Makefile b/Makefile
index 98df2098..dd0c51e9 100644
--- a/Makefile
+++ b/Makefile
@@ -1,5 +1,6 @@
 OS?=linux64
 ENV?=gfortran64
+IRBEM_NTIME_MAX?=100000
 
 include compile/$(OS)-$(ENV).make
 
@@ -30,12 +31,17 @@ $(SRC_DIR)/fortran_version.inc :
 	@echo "        INTEGER*4 FORTRAN_VERSION ! generated by Makefile $(BUILD_DATE)" > $@
 	@echo "        PARAMETER (FORTRAN_VERSION = $(REV) ) ! Generated by Makefile"  >> $@
 
+$(SRC_DIR)/ntime_max.inc:
+	@echo "Creating $@ with NTIME_MAX=$(IRBEM_NTIME_MAX). Set IRBEM_NTIME_MAX to override."
+	@echo "        INTEGER*4 NTIME_MAX ! generated by Make File" > $@
+	@echo "        PARAMETER (NTIME_MAX =  $(IRBEM_NTIME_MAX) ) ! Generated by Make File" >> $@
+
 $(SRC_DIR)/fortran_release.inc :
 	@echo "Creating $@ for release $(RELEASE) Set RELEASE to override."
 	@echo "        CHARACTER*80 FORTRAN_RELEASE ! Generated by Makefile  $(BUILD_DATE)" > $@
 	@echo "        PARAMETER (FORTRAN_RELEASE = '$(RELEASE)')"                     >> $@
 
-.PHONY : $(SRC_DIR)/fortran_version.inc $(SRC_DIR)/fortran_release.inc
+.PHONY : $(SRC_DIR)/fortran_version.inc $(SRC_DIR)/fortran_release.inc $(SRC_DIR)/ntime_max.inc
 
 # Help text (as per README.install)
 all.help:
@@ -96,7 +102,7 @@ C99_SOURCES = $(wildcard $(SRC_DIR)/*.c)
 F77_OBJS = $(patsubst $(SRC_DIR)/%.f,$(BIN_DIR)/%.o,$(F77_SOURCES))
 C99_OBJS = $(patsubst $(SRC_DIR)/%.c,$(BIN_DIR)/%.o,$(C99_SOURCES))
 
-$(BIN_DIR)/onera_desp_lib.o : $(SRC_DIR)/fortran_version.inc $(SRC_DIR)/fortran_release.inc
+$(BIN_DIR)/onera_desp_lib.o : $(SRC_DIR)/fortran_version.inc $(SRC_DIR)/fortran_release.inc $(SRC_DIR)/ntime_max.inc
 
 $(BIN_DIR)/%.o : $(SRC_DIR)/%.f
 	$(FC) $(FFLAGS) -c -o $@ $<