diff --git a/.promu.yml b/.promu.yml
index 27aa3aaed..d4ec92803 100644
--- a/.promu.yml
+++ b/.promu.yml
@@ -1,3 +1,4 @@
+go: 1.7.1
 repository:
     path: github.com/prometheus/prometheus
 build:
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8a6c00035..3e399132c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,9 @@
+## 1.2.1 / 2016-10-10
+
+* [BUGFIX] Count chunk evictions properly so that the server doesn't
+  assume it runs out of memory and subsequencly throttles ingestion.
+* [BUGFIX] Use Go1.7.1 for prebuilt binaries to fix issues on MacOS Sierra.
+
 ## 1.2.0 / 2016-10-07
 
 * [FEATURE] Cleaner encoding of query parameters in `/graph` URLs.
diff --git a/VERSION b/VERSION
index 26aaba0e8..6085e9465 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-1.2.0
+1.2.1
diff --git a/storage/local/chunk/chunk.go b/storage/local/chunk/chunk.go
index 738e678f1..11c42b39d 100644
--- a/storage/local/chunk/chunk.go
+++ b/storage/local/chunk/chunk.go
@@ -252,6 +252,8 @@ func (d *Desc) MaybeEvict() bool {
 		panic("ChunkLastTime not populated for evicted chunk")
 	}
 	d.C = nil
+	Ops.WithLabelValues(Evict).Inc()
+	atomic.AddInt64(&NumMemChunks, -1)
 	return true
 }
 
diff --git a/storage/local/storage_test.go b/storage/local/storage_test.go
index ce7ed2bd6..e3b31620b 100644
--- a/storage/local/storage_test.go
+++ b/storage/local/storage_test.go
@@ -20,6 +20,7 @@ import (
 	"math/rand"
 	"os"
 	"strconv"
+	"sync/atomic"
 	"testing"
 	"testing/quick"
 	"time"
@@ -1412,6 +1413,10 @@ func testEvictAndLoadChunkDescs(t *testing.T, encoding chunk.Encoding) {
 		Value:     model.SampleValue(3.14),
 	}
 
+	// Sadly, chunk.NumMemChunks is a global variable. We have to reset it
+	// explicitly here.
+	atomic.StoreInt64(&chunk.NumMemChunks, 0)
+
 	s, closer := NewTestStorage(t, encoding)
 	defer closer.Close()
 
@@ -1441,6 +1446,9 @@ func testEvictAndLoadChunkDescs(t *testing.T, encoding chunk.Encoding) {
 	if oldLen <= len(series.chunkDescs) {
 		t.Errorf("Expected number of chunkDescs to decrease, old number %d, current number %d.", oldLen, len(series.chunkDescs))
 	}
+	if int64(len(series.chunkDescs)) < atomic.LoadInt64(&chunk.NumMemChunks) {
+		t.Errorf("NumMemChunks is larger than number of chunk descs, number of chunk descs: %d, NumMemChunks: %d.", len(series.chunkDescs), atomic.LoadInt64(&chunk.NumMemChunks))
+	}
 
 	// Load everything back.
 	it := s.preloadChunksForRange(makeFingerprintSeriesPair(s, fp), 0, 100000)