diff --git a/jerry-core/CMakeLists.txt b/jerry-core/CMakeLists.txt
index eeb67f55a..52fd9cf1f 100644
--- a/jerry-core/CMakeLists.txt
+++ b/jerry-core/CMakeLists.txt
@@ -150,6 +150,9 @@ project (JerryCore C ASM)
  # Jerry port
  if(NOT ("${PORT_DIR}" STREQUAL ""))
   file(GLOB SOURCE_PORT_FILES ${PORT_DIR}/*.c)
+  if (NOT USE_JERRY_LIBC)
+   set (DEFINES_JERRY ${DEFINES_JERRY} _BSD_SOURCE)
+  endif()
  endif()
 
  # All-in-one build
diff --git a/targets/default/jerry-port-default-date.c b/targets/default/jerry-port-default-date.c
index 8975b9e98..d09e48990 100644
--- a/targets/default/jerry-port-default-date.c
+++ b/targets/default/jerry-port-default-date.c
@@ -14,7 +14,6 @@
  * limitations under the License.
  */
 
-#define _BSD_SOURCE
 #include <sys/time.h>
 
 #include "jerry-port.h"