diff --git a/INSTALL.md b/INSTALL.md
index eb55acfd..2aaa33e1 100644
--- a/INSTALL.md
+++ b/INSTALL.md
@@ -250,6 +250,13 @@ any of the following arguments (not a definitive list) to 'configure':
     configuration, jemalloc will provide additional size classes that are not
     16-byte-aligned (24, 40, and 56).
 
+* `--with-lg-slab-maxregs=<lg-slab-maxregs>`
+
+    Specify the maximum number of regions in a slab, which is
+    (<lg-page> - <lg-tiny-min>) by default. This increases the limit of slab
+    sizes specified by "slab_sizes" in malloc_conf. This should never be less
+    than the default value.
+
 * `--with-lg-vaddr=<lg-vaddr>`
 
     Specify the number of significant virtual address bits.  By default, the
diff --git a/configure.ac b/configure.ac
index d68d376c..7c203020 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1586,6 +1586,15 @@ if test "x$with_lg_quantum" != "x" ; then
   AC_DEFINE_UNQUOTED([LG_QUANTUM], [$with_lg_quantum])
 fi
 
+AC_ARG_WITH([lg_slab_maxregs],
+  [AS_HELP_STRING([--with-lg-slab-maxregs=<lg-slab-maxregs>],
+   [Base 2 log of maximum number of regions in a slab (used with malloc_conf slab_sizes)])],
+  [LG_SLAB_MAXREGS="with_lg_slab_maxregs"],
+  [LG_SLAB_MAXREGS=""])
+if test "x$with_lg_slab_maxregs" != "x" ; then
+  AC_DEFINE_UNQUOTED([LG_SLAB_MAXREGS], [$with_lg_slab_maxregs])
+fi
+
 AC_ARG_WITH([lg_page],
   [AS_HELP_STRING([--with-lg-page=<lg-page>], [Base 2 log of system page size])],
   [LG_PAGE="$with_lg_page"], [LG_PAGE="detect"])
diff --git a/include/jemalloc/internal/jemalloc_internal_defs.h.in b/include/jemalloc/internal/jemalloc_internal_defs.h.in
index ee052bb8..7a4ebf17 100644
--- a/include/jemalloc/internal/jemalloc_internal_defs.h.in
+++ b/include/jemalloc/internal/jemalloc_internal_defs.h.in
@@ -182,6 +182,9 @@
 /* One page is 2^LG_PAGE bytes. */
 #undef LG_PAGE
 
+/* Maximum number of regions in a slab. */
+#undef LG_SLAB_MAXREGS
+
 /*
  * One huge page is 2^LG_HUGEPAGE bytes.  Note that this is defined even if the
  * system does not explicitly support huge pages; system calls that require
diff --git a/include/jemalloc/internal/sc.h b/include/jemalloc/internal/sc.h
index 138da5c0..133763da 100644
--- a/include/jemalloc/internal/sc.h
+++ b/include/jemalloc/internal/sc.h
@@ -270,8 +270,14 @@
 #define SC_LARGE_MAXCLASS (SC_MAX_BASE + (SC_NGROUP - 1) * SC_MAX_DELTA)
 
 /* Maximum number of regions in one slab. */
-#define SC_LG_SLAB_MAXREGS (LG_PAGE - SC_LG_TINY_MIN)
-#define SC_SLAB_MAXREGS (1U << LG_SLAB_MAXREGS)
+#ifndef LG_SLAB_MAXREGS
+#  define SC_LG_SLAB_MAXREGS (LG_PAGE - SC_LG_TINY_MIN)
+#elif (LG_SLAB_MAXREGS < (LG_PAGE - SC_LG_TINY_MIN))
+#  error "Unsupported SC_LG_SLAB_MAXREGS"
+#else
+#  define SC_LG_SLAB_MAXREGS LG_SLAB_MAXREGS
+#endif
+#define SC_SLAB_MAXREGS (1U << SC_LG_SLAB_MAXREGS)
 
 
 typedef struct sc_s sc_t;