diff --git a/c_src/decoder.c b/c_src/decoder.c
index a6fc8fe..985a647 100644
--- a/c_src/decoder.c
+++ b/c_src/decoder.c
@@ -16,7 +16,7 @@
 #define STACK_SIZE_INC 64
 #define NUM_BUF_LEN 32
 
-#ifdef WINDOWS || WIN32
+#if WINDOWS || WIN32
 #define snprintf  _snprintf
 #endif
 
diff --git a/c_src/encoder.c b/c_src/encoder.c
index 1b4baaf..ce71c1b 100644
--- a/c_src/encoder.c
+++ b/c_src/encoder.c
@@ -20,7 +20,7 @@ do {                                \
     }                               \
 } while(0)
 
-#ifdef WINDOWS || WIN32
+#if WINDOWS || WIN32
 #define inline __inline
 #define snprintf  _snprintf
 #endif