diff --git a/src/system/libroot/posix/locale/wctype.cpp b/src/system/libroot/posix/locale/wctype.cpp
index c09892659d..a0174dafda 100644
--- a/src/system/libroot/posix/locale/wctype.cpp
+++ b/src/system/libroot/posix/locale/wctype.cpp
@@ -3,7 +3,6 @@
 ** Distributed under the terms of the Haiku License.
 */
 
-#define B_USE_POSITIVE_POSIX_ERRORS
 #include <ctype.h>
 #include <errno.h>
 #include <string.h>
diff --git a/src/system/libroot/posix/string/strcoll.cpp b/src/system/libroot/posix/string/strcoll.cpp
index 906adb66cc..6f45badc51 100644
--- a/src/system/libroot/posix/string/strcoll.cpp
+++ b/src/system/libroot/posix/string/strcoll.cpp
@@ -4,7 +4,6 @@
  * All rights reserved. Distributed under the terms of the MIT License.
  */
 
-#define B_USE_POSITIVE_POSIX_ERRORS
 #include <errno.h>
 #include <string.h>
 
diff --git a/src/system/libroot/posix/string/strxfrm.cpp b/src/system/libroot/posix/string/strxfrm.cpp
index daa97ece14..9a19996b09 100644
--- a/src/system/libroot/posix/string/strxfrm.cpp
+++ b/src/system/libroot/posix/string/strxfrm.cpp
@@ -4,7 +4,6 @@
  * All rights reserved. Distributed under the terms of the MIT license.
  */
 
-#define B_USE_POSITIVE_POSIX_ERRORS
 #include <errno.h>
 #include <string.h>
 
diff --git a/src/tests/system/libroot/posix/locale_test.cpp b/src/tests/system/libroot/posix/locale_test.cpp
index e2a62b6df4..28928b19f6 100644
--- a/src/tests/system/libroot/posix/locale_test.cpp
+++ b/src/tests/system/libroot/posix/locale_test.cpp
@@ -3,8 +3,6 @@
  * Distributed under the terms of the MIT License.
  */
 
-#define B_USE_POSITIVE_POSIX_ERRORS
-
 #include <ctype.h>
 #include <errno.h>
 #include <langinfo.h>