diff --git a/package/libcurl/libcurl.mk b/package/libcurl/libcurl.mk
index 68d638609b..8501910ac5 100644
--- a/package/libcurl/libcurl.mk
+++ b/package/libcurl/libcurl.mk
@@ -14,7 +14,6 @@ LIBCURL_LICENSE = curl
 LIBCURL_LICENSE_FILES = COPYING
 LIBCURL_CPE_ID_VENDOR = haxx
 LIBCURL_INSTALL_STAGING = YES
-LIBCURL_CONF_ENV += CFLAGS="$(TARGET_CFLAGS) -D_GNU_SOURCE"
 
 # We disable NTLM delegation to winbinds ntlm_auth ('--disable-ntlm-wb')
 # support because it uses fork(), which doesn't work on non-MMU platforms.