diff --git a/src/system/libroot/posix/rpmalloc/rpmalloc.cpp b/src/system/libroot/posix/rpmalloc/rpmalloc.cpp
index 4fd7fb9e9d..2bcb96cbef 100644
--- a/src/system/libroot/posix/rpmalloc/rpmalloc.cpp
+++ b/src/system/libroot/posix/rpmalloc/rpmalloc.cpp
@@ -61,9 +61,13 @@
 #define DISABLE_UNMAP             0
 #endif
 #ifndef DEFAULT_SPAN_MAP_COUNT
+#ifdef __HAIKU__
+#define DEFAULT_SPAN_MAP_COUNT    32
+#else
 //! Default number of spans to map in call to map more virtual memory (default values yield 4MiB here)
 #define DEFAULT_SPAN_MAP_COUNT    64
 #endif
+#endif
 
 #if ENABLE_THREAD_CACHE
 #ifndef ENABLE_UNLIMITED_CACHE