diff --git a/include/jemalloc/internal/sc.h b/include/jemalloc/internal/sc.h
index 6bc5db37..138da5c0 100644
--- a/include/jemalloc/internal/sc.h
+++ b/include/jemalloc/internal/sc.h
@@ -246,8 +246,9 @@
 #  error "Too many small size classes"
 #endif
 
-/* The largest size class in the lookup table. */
-#define SC_LOOKUP_MAXCLASS ((size_t)1 << 12)
+/* The largest size class in the lookup table, and its binary log. */
+#define SC_LG_MAX_LOOKUP 12
+#define SC_LOOKUP_MAXCLASS ((size_t)1 << SC_LG_MAX_LOOKUP)
 
 /* Internal, only used for the definition of SC_SMALL_MAXCLASS. */
 #define SC_SMALL_MAX_BASE ((size_t)1 << (LG_PAGE + SC_LG_NGROUP - 1))
diff --git a/src/sc.c b/src/sc.c
index cfce533f..1474eacc 100644
--- a/src/sc.c
+++ b/src/sc.c
@@ -259,10 +259,8 @@ void
 sc_data_init(sc_data_t *sc_data) {
 	assert(!sc_data->initialized);
 
-	int lg_max_lookup = 12;
-
 	size_classes(sc_data, LG_SIZEOF_PTR, LG_QUANTUM, SC_LG_TINY_MIN,
-	    lg_max_lookup, LG_PAGE, SC_LG_NGROUP);
+	    SC_LG_MAX_LOOKUP, LG_PAGE, SC_LG_NGROUP);
 
 	sc_data->initialized = true;
 }