diff --git a/COLLADA2GLTF/JSON/JSONNumber.cpp b/COLLADA2GLTF/JSON/JSONNumber.cpp
index b18a2b3beb..bf93e08d6e 100644
--- a/COLLADA2GLTF/JSON/JSONNumber.cpp
+++ b/COLLADA2GLTF/JSON/JSONNumber.cpp
@@ -25,6 +25,7 @@
 // THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 #include "GLTF.h"
+#include <cstring>
 
 #if __cplusplus <= 199711L
 using namespace std::tr1;
diff --git a/COLLADA2GLTF/helpers/geometryHelpers.cpp b/COLLADA2GLTF/helpers/geometryHelpers.cpp
index 7d02e4b842..0e164fcf94 100644
--- a/COLLADA2GLTF/helpers/geometryHelpers.cpp
+++ b/COLLADA2GLTF/helpers/geometryHelpers.cpp
@@ -24,6 +24,7 @@
 #include "GLTF.h"
 #include <stdio.h>
 #include <stdlib.h>
+#include <cstring>
 #include "geometryHelpers.h"
 
 #if __cplusplus <= 199711L
@@ -834,4 +835,4 @@ namespace GLTF
     }
     */
     
-}
\ No newline at end of file
+}