diff --git a/c_src/decoder.c b/c_src/decoder.c
index e8d3ac9..a6fc8fe 100644
--- a/c_src/decoder.c
+++ b/c_src/decoder.c
@@ -16,6 +16,10 @@
 #define STACK_SIZE_INC 64
 #define NUM_BUF_LEN 32
 
+#ifdef WINDOWS || WIN32
+#define snprintf  _snprintf
+#endif
+
 enum {
     st_value=0,
     st_object,
diff --git a/c_src/encoder.c b/c_src/encoder.c
index cdca18e..f063f77 100644
--- a/c_src/encoder.c
+++ b/c_src/encoder.c
@@ -20,6 +20,10 @@ do {                                \
     }                               \
 } while(0)
 
+#ifdef WINDOWS || WIN32
+#define inline __inline
+#define snprintf  _snprintf
+#endif
 
 typedef struct {
     ErlNifEnv*      env;