diff --git a/CHANGES b/CHANGES
index 693dc36dac..e9b5b1c925 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,4 +1,9 @@
 
+2.1-948 | 2013-07-31 20:08:28 -0700
+
+  * Fix segfault caused by merging an empty bloom-filter with a
+    bloom-filter already containing values. (Bernhard Amann)
+
 2.1-945 | 2013-07-30 10:05:10 -0700
 
   * Make hashers serializable. (Matthias Vallentin)
diff --git a/VERSION b/VERSION
index 6b605113b8..aaa6984d5f 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-2.1-945
+2.1-948
diff --git a/src/OpaqueVal.cc b/src/OpaqueVal.cc
index 66b3c081e7..6939362ab8 100644
--- a/src/OpaqueVal.cc
+++ b/src/OpaqueVal.cc
@@ -591,7 +591,9 @@ bool BloomFilterVal::Empty() const
 BloomFilterVal* BloomFilterVal::Merge(const BloomFilterVal* x,
 				      const BloomFilterVal* y)
 	{
-	if ( ! same_type(x->Type(), y->Type()) )
+	if ( x->Type() && // any one 0 is ok here
+	     y->Type() &&
+	     ! same_type(x->Type(), y->Type()) )
 		{
 		reporter->Error("cannot merge Bloom filters with different types");
 		return 0;
@@ -613,7 +615,7 @@ BloomFilterVal* BloomFilterVal::Merge(const BloomFilterVal* x,
 
 	BloomFilterVal* merged = new BloomFilterVal(copy);
 
-	if ( ! merged->Typify(x->Type()) )
+	if ( x->Type() && ! merged->Typify(x->Type()) )
 		{
 		reporter->Error("failed to set type on merged Bloom filter");
 		return 0;
diff --git a/src/probabilistic/bloom-filter.bif b/src/probabilistic/bloom-filter.bif
index a3567ad6f7..1797f941d2 100644
--- a/src/probabilistic/bloom-filter.bif
+++ b/src/probabilistic/bloom-filter.bif
@@ -186,7 +186,9 @@ function bloomfilter_merge%(bf1: opaque of bloomfilter,
 	const BloomFilterVal* bfv1 = static_cast<const BloomFilterVal*>(bf1);
 	const BloomFilterVal* bfv2 = static_cast<const BloomFilterVal*>(bf2);
 
-	if ( ! same_type(bfv1->Type(), bfv2->Type()) )
+	if ( bfv1->Type() && // any one 0 is ok here
+	     bfv2->Type() &&
+	     ! same_type(bfv1->Type(), bfv2->Type()) )
 		{
 		reporter->Error("incompatible Bloom filter types");
 		return 0;
diff --git a/testing/btest/Baseline/bifs.bloomfilter/output b/testing/btest/Baseline/bifs.bloomfilter/output
index 14e1f038c0..991308e10b 100644
--- a/testing/btest/Baseline/bifs.bloomfilter/output
+++ b/testing/btest/Baseline/bifs.bloomfilter/output
@@ -17,6 +17,7 @@ error: false-positive rate must take value between 0 and 1
 1
 1
 1
+1
 2
 3
 3
diff --git a/testing/btest/bifs/bloomfilter.bro b/testing/btest/bifs/bloomfilter.bro
index 3b40f29553..f2c882d175 100644
--- a/testing/btest/bifs/bloomfilter.bro
+++ b/testing/btest/bifs/bloomfilter.bro
@@ -45,6 +45,11 @@ function test_basic_bloom_filter()
   print bloomfilter_lookup(bf_merged, 84);
   print bloomfilter_lookup(bf_merged, 100);
   print bloomfilter_lookup(bf_merged, 168);
+
+  #empty filter tests
+  local bf_empty = bloomfilter_basic_init(0.1, 1000);
+  local bf_empty_merged = bloomfilter_merge(bf_merged, bf_empty);
+  print bloomfilter_lookup(bf_empty_merged, 42);
   }
 
 function test_counting_bloom_filter()