diff --git a/Makefile b/Makefile
index 1acaec6..a22fc22 100644
--- a/Makefile
+++ b/Makefile
@@ -29,7 +29,7 @@ override CFLAGS += -DLFS_YES_TRACE
 endif
 override CFLAGS += -I.
 override CFLAGS += -std=c99 -Wall -pedantic
-override CFLAGS += -Wextra -Wshadow -Wjump-misses-init
+override CFLAGS += -Wextra -Wshadow -Wjump-misses-init -Wundef
 # Remove missing-field-initializers because of GCC bug
 override CFLAGS += -Wno-missing-field-initializers
 
diff --git a/lfs.c b/lfs.c
index 06e37ac..b10c186 100644
--- a/lfs.c
+++ b/lfs.c
@@ -1502,7 +1502,7 @@ static int lfs_dir_compact(lfs_t *lfs,
                     end = begin;
                 }
             }
-#if LFS_MIGRATE
+#ifdef LFS_MIGRATE
         } else if (lfs_pair_cmp(dir->pair, lfs->root) == 0 && lfs->lfs1) {
             // we can't relocate our root during migrations, as this would
             // cause the superblock to get updated, which would clobber v1