diff --git a/src/epanet.c b/src/epanet.c
index 267a0de..53b1040 100644
--- a/src/epanet.c
+++ b/src/epanet.c
@@ -106,6 +106,7 @@ execute function x and set the error code equal to its return value.
 
 *******************************************************************************
 */
+#define _CRT_SECURE_NO_DEPRECATE
 
 /*** New compile directives ***/                                               //(2.00.11 - LR)
 //#define CLE     /* Compile as a command line executable */
diff --git a/src/hydraul.c b/src/hydraul.c
index 722b40c..51b30a6 100644
--- a/src/hydraul.c
+++ b/src/hydraul.c
@@ -45,6 +45,7 @@ AUTHOR:     L. Rossman
      writehydwarn() -- see REPORT.C
 *******************************************************************
 */
+#define _CRT_SECURE_NO_DEPRECATE
 
 #include <stdio.h>
 #include <string.h>
diff --git a/src/inpfile.c b/src/inpfile.c
index 204d61f..cf5d84f 100644
--- a/src/inpfile.c
+++ b/src/inpfile.c
@@ -18,6 +18,7 @@ data describing a piping network to a file in EPANET's text format.
                                                                     
 ********************************************************************
 */
+#define _CRT_SECURE_NO_DEPRECATE
 
 #include <stdio.h>
 #include <string.h>
diff --git a/src/input1.c b/src/input1.c
index 4ef941c..b78254c 100644
--- a/src/input1.c
+++ b/src/input1.c
@@ -20,6 +20,7 @@ AUTHOR:     L. Rossman
 
 *********************************************************************
 */
+#define _CRT_SECURE_NO_DEPRECATE
 
 #include <stdio.h>
 #include <stdlib.h>
diff --git a/src/input2.c b/src/input2.c
index e680f0d..6c73b19 100644
--- a/src/input2.c
+++ b/src/input2.c
@@ -24,6 +24,7 @@ The following utility functions are all called from INPUT3.C
 
 **********************************************************************
 */
+#define _CRT_SECURE_NO_DEPRECATE
 
 #include <stdlib.h>
 #include <stdio.h>
diff --git a/src/input3.c b/src/input3.c
index a8fdfe0..7022639 100644
--- a/src/input3.c
+++ b/src/input3.c
@@ -19,6 +19,7 @@ All functions in this module are called from newline() in INPUT2.C.
 
 **********************************************************************
 */
+#define _CRT_SECURE_NO_DEPRECATE
 
 #include <stdlib.h>
 #include <stdio.h>
diff --git a/src/report.c b/src/report.c
index ad22934..1e00547 100644
--- a/src/report.c
+++ b/src/report.c
@@ -24,6 +24,7 @@ formatted string S to the report file.
                                                                     
 ********************************************************************
 */
+#define _CRT_SECURE_NO_DEPRECATE
 
 #include <stdio.h>
 #include <string.h>
diff --git a/src/rules.c b/src/rules.c
index fda54b1..a786875 100644
--- a/src/rules.c
+++ b/src/rules.c
@@ -22,6 +22,8 @@ AUTHOR:     L. Rossman
 
 **********************************************************************
 */
+#define _CRT_SECURE_NO_DEPRECATE
+
 #include <stdio.h>
 #include <string.h>
 #include <malloc.h>