diff --git a/Src/InputStream.c b/Src/InputStream.c
index 1539841..5daf91f 100644
--- a/Src/InputStream.c
+++ b/Src/InputStream.c
@@ -1,6 +1,16 @@
 #include "InputStream.h"
 #include <string.h>
 
+#if ISTREAM
+
+#if !STREAM_READ
+    #error "For using InputStream Library you must enable STREAM_READ in StreamBuffer.h"
+#endif
+
+#if !STREAM_PENDING_BYTES
+    #error "For using InputStream Library you must enable STREAM_PENDING_BYTES in StreamBuffer.h"
+#endif
+
 /**
  * @brief Initialize InputStream
  *
@@ -118,3 +128,5 @@ void IStream_onFull(IStream* stream, IStream_OnFullFn fn) {
     stream->onFull = fn;
 }
 #endif
+
+#endif // ISTREAM
diff --git a/Src/InputStream.h b/Src/InputStream.h
index 523ee22..e31fa86 100644
--- a/Src/InputStream.h
+++ b/Src/InputStream.h
@@ -24,7 +24,10 @@ extern "C" {
 /************************************************************************/
 /*                            Configuration                             */
 /************************************************************************/
-
+/**
+ * @brief This lable shows OStream Libraty is enabled or not
+ */
+#define ISTREAM                     (1 && STREAM_READ && STREAM_PENDING_BYTES)
 /**
  * @brief enable checkTransmit function
  */
@@ -37,19 +40,6 @@ extern "C" {
 
 /************************************************************************/
 
-#if !STREAM_READ
-    #error "For using InputStream Library you must enable STREAM_READ in StreamBuffer.h"
-#endif
-
-#if !STREAM_PENDING_BYTES
-    #error "For using InputStream Library you must enable STREAM_PENDING_BYTES in StreamBuffer.h"
-#endif
-
-/**
- * @brief This lable shows OStream Libraty is enabled or not
- */
-#define ISTREAM                     (STREAM_READ && STREAM_PENDING_BYTES)
-
 /**
  * @brief show stream version in string format
  */