diff --git a/src/c/dlmalloc.c b/src/c/dlmalloc.c
index 80e5e78903eadfd4cc08e0e2e7c3ad83169b38a0..6ad2b06274d7e5f1861b5d282cc81fccfd455635 100644
--- a/src/c/dlmalloc.c
+++ b/src/c/dlmalloc.c
@@ -524,7 +524,7 @@ MAX_RELEASE_CHECK_RATE   default: 4095 unless not HAVE_MMAP
 /* Customizations { */
 
 #define HAVE_MMAP 1
-#define MSPACES 1
+#define ONLY_MSPACES 1
 #define LACKS_ERRNO_H
 #define LACKS_FCNTL_H
 #define LACKS_SCHED_H