diff --git a/repos/libports/lib/mk/libext2fs.mk b/repos/libports/lib/mk/libext2fs.mk
index e02a72179..d11b46428 100644
--- a/repos/libports/lib/mk/libext2fs.mk
+++ b/repos/libports/lib/mk/libext2fs.mk
@@ -19,6 +19,8 @@ CC_OPT += -Wno-unused-function -Wno-unused-variable \
           -Wno-unused-but-set-variable -Wno-cpp \
           -Wno-maybe-uninitialized -Wno-uninitialized
 
+CC_C_OPT += -std=gnu89
+
 LIBS += libc
 
 vpath %.c $(EXT2FS_DIR)
diff --git a/repos/libports/src/server/fuse_fs/ext2/target.mk b/repos/libports/src/server/fuse_fs/ext2/target.mk
index b59802400..e4add616b 100644
--- a/repos/libports/src/server/fuse_fs/ext2/target.mk
+++ b/repos/libports/src/server/fuse_fs/ext2/target.mk
@@ -17,6 +17,8 @@ CC_OPT += -Wno-unused-function -Wno-unused-variable \
           -Wno-unused-but-set-variable -Wno-cpp \
           -Wno-maybe-uninitialized
 
+CC_C_OPT += -std=gnu89
+
 CC_C_OPT += -Wno-implicit-function-declaration