diff --git a/package/crda/Makefile b/package/crda/Makefile
index 658511705242f8e66ecf44f9ef2f14a70a03efce..e53db3dfdc37c075b19fc33a399b135134d1c91a 100644
--- a/package/crda/Makefile
+++ b/package/crda/Makefile
@@ -51,6 +51,7 @@ endef
 
 TARGET_CPPFLAGS := \
 	-I$(STAGING_DIR)/usr/include/libnl-tiny \
+	-D_GNU_SOURCE \
 	$(TARGET_CPPFLAGS)
 
 MAKE_FLAGS += \
diff --git a/package/hostapd/Makefile b/package/hostapd/Makefile
index bd873b9b2f40ee5e69927692472139d0188526ff..6d0b18bcd929239f81ccc747256710bbe3d68200 100644
--- a/package/hostapd/Makefile
+++ b/package/hostapd/Makefile
@@ -98,7 +98,8 @@ TARGET_CPPFLAGS := \
 	$(TARGET_CPPFLAGS) \
 	-I$(STAGING_DIR)/usr/include/madwifi \
 	-I$(STAGING_DIR)/usr/include/mac80211 \
-	-DCONFIG_LIBNL20
+	-DCONFIG_LIBNL20 \
+	-D_GNU_SOURCE
 
 define Build/CompileTarget
 	CFLAGS="$(TARGET_CPPFLAGS) $(TARGET_CFLAGS)" \
diff --git a/package/iw/Makefile b/package/iw/Makefile
index 9187b55c85948511c606e3a8c333994caa48c9b7..fb10f10f2f391565de611b7d7e96faa7bf67994c 100644
--- a/package/iw/Makefile
+++ b/package/iw/Makefile
@@ -37,7 +37,8 @@ TARGET_CPPFLAGS:= \
 	-I$(STAGING_DIR)/usr/include/libnl-tiny \
 	-I$(STAGING_DIR)/usr/include/mac80211 \
 	$(TARGET_CPPFLAGS) \
-	-DCONFIG_LIBNL20
+	-DCONFIG_LIBNL20 \
+	-D_GNU_SOURCE
 
 MAKE_FLAGS += \
 	CFLAGS="$(TARGET_CPPFLAGS) $(TARGET_CFLAGS)" \