diff --git a/ChangeLog b/ChangeLog
index 2a8bbe906f..b0c5246876 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Wed Feb  4 16:32:40 2015  Matt Hoyle  <matt@deployable.co>
+
+	* ext/bigdecimal/bigdecimal.c (VpSetPTR): fix a typo, 'expoennt'
+	  to 'exponent'.  [ruby-core:67980] [Bug #10823] [Fix GH-825]
+
 Wed Feb  4 15:55:38 2015  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* ext/sdbm/_sdbm.c: include ruby/ruby.h for PRIdPTRDIFF when a
diff --git a/ext/bigdecimal/bigdecimal.c b/ext/bigdecimal/bigdecimal.c
index 6d3ef77b14..ea88eb41c2 100644
--- a/ext/bigdecimal/bigdecimal.c
+++ b/ext/bigdecimal/bigdecimal.c
@@ -4453,7 +4453,7 @@ VpSetPTR(Real *a, Real *b, Real *c, size_t *a_pos, size_t *b_pos, size_t *c_pos,
 
     size_t const round_limit = (VpGetPrecLimit() + BASE_FIG - 1) / BASE_FIG;
 
-    assert(a->exponent >= b->expoennt);
+    assert(a->exponent >= b->exponent);
 
     c->frac[0] = 0;
     *av = *bv = 0;