diff --git a/src/datasource/domain.c b/src/datasource/domain.c
index 0022b038..b918ce1d 100644
--- a/src/datasource/domain.c
+++ b/src/datasource/domain.c
@@ -114,7 +114,7 @@ int snoopy_datasource_domain (char * const resultBuf, size_t resultBufSize, __at
 
 
     /* Read line by line */
-    const char *linePtr;
+    char *linePtr;
     char *hashPtr;
     char *lineEntryPtr;
     char *savePtr;
diff --git a/src/snoopy.h b/src/snoopy.h
index c5adfcb5..28a5298b 100644
--- a/src/snoopy.h
+++ b/src/snoopy.h
@@ -28,7 +28,9 @@
  * - prevents GCC from complaining about not using strerror_r return value
  * - enables strdup() presence
  */
+#ifndef  _XOPEN_SOURCE
 #define  _XOPEN_SOURCE   700
+#endif