diff --git a/bignum.c b/bignum.c
index e9bb5780b5..07b7cb2101 100644
--- a/bignum.c
+++ b/bignum.c
@@ -3409,7 +3409,7 @@ rb_absint_numwords(VALUE val, size_t word_numbits, size_t *nlz_bits_ret)
     size_t numbytes;
     int nlz_bits_in_msbyte;
     size_t numwords;
-    size_t nlz_bits;
+    size_t nlz_bits = 0;
 
     if (word_numbits == 0)
         return (size_t)-1;
diff --git a/vm_method.c b/vm_method.c
index 1bcec9bc5f..d1afb88e40 100644
--- a/vm_method.c
+++ b/vm_method.c
@@ -894,7 +894,7 @@ rb_method_entry_at(VALUE klass, ID id)
 static inline rb_method_entry_t*
 search_method(VALUE klass, ID id, VALUE *defined_class_ptr)
 {
-    rb_method_entry_t *me;
+    rb_method_entry_t *me = NULL;
 
     RB_DEBUG_COUNTER_INC(mc_search);