diff --git a/cJSON.c b/cJSON.c
index 6e8255a..9c86128 100644
--- a/cJSON.c
+++ b/cJSON.c
@@ -23,6 +23,11 @@
 /* cJSON */
 /* JSON parser in C. */
 
+/* disable warnings about old C89 functions in MSVC */
+#if !defined(_CRT_SECURE_NO_DEPRECATE) && defined(_MSC_VER)
+#define _CRT_SECURE_NO_DEPRECATE
+#endif
+
 #ifdef __GNUC__
 #pragma GCC visibility push(default)
 #endif
diff --git a/cJSON_Utils.c b/cJSON_Utils.c
index 84319cc..e7bf802 100644
--- a/cJSON_Utils.c
+++ b/cJSON_Utils.c
@@ -20,6 +20,10 @@
   THE SOFTWARE.
 */
 
+/* disable warnings about old C89 functions in MSVC */
+#if !defined(_CRT_SECURE_NO_DEPRECATE) && defined(_MSC_VER)
+#define _CRT_SECURE_NO_DEPRECATE
+#endif
 #pragma GCC visibility push(default)
 #include <ctype.h>
 #include <string.h>