diff --git a/solr/core/src/java/org/apache/solr/update/processor/DistributedUpdateProcessor.java b/solr/core/src/java/org/apache/solr/update/processor/DistributedUpdateProcessor.java
index 622776597a1..9a4ca0ab29c 100644
--- a/solr/core/src/java/org/apache/solr/update/processor/DistributedUpdateProcessor.java
+++ b/solr/core/src/java/org/apache/solr/update/processor/DistributedUpdateProcessor.java
@@ -516,12 +516,41 @@ public class DistributedUpdateProcessor extends UpdateRequestProcessor {
             oldDoc.addField( sif.getName(), fieldVal, sif.getBoost());
           } else if ("set".equals(key)) {
             oldDoc.setField(sif.getName(),  fieldVal, sif.getBoost());
+          } else if ("inc".equals(key)) {
+            SolrInputField numericField = oldDoc.get(sif.getName());
+            if (numericField == null) {
+              oldDoc.setField(sif.getName(),  fieldVal, sif.getBoost());
+            } else {
+              // TODO: fieldtype needs externalToObject?
+              String oldValS = numericField.getFirstValue().toString();
+              SchemaField sf = cmd.getReq().getSchema().getField(sif.getName());
+              BytesRef term = new BytesRef();
+              sf.getType().readableToIndexed(oldValS, term);
+              Object oldVal = sf.getType().toObject(sf, term);
+
+              String fieldValS = fieldVal.toString();
+              Number result;
+              if (oldVal instanceof Long) {
+                result = ((Long) oldVal).longValue() + Long.parseLong(fieldValS);
+              } else if (oldVal instanceof Float) {
+                result = ((Float) oldVal).floatValue() + Float.parseFloat(fieldValS);
+              } else if (oldVal instanceof Double) {
+                result = ((Double) oldVal).doubleValue() + Double.parseDouble(fieldValS);
+              } else {
+                // int, short, byte
+                result = ((Integer) oldVal).intValue() + Integer.parseInt(fieldValS);
+              }
+
+              oldDoc.setField(sif.getName(),  result, sif.getBoost());
+            }
+
           }
         }
       } else {
         // normal fields are treated as a "set"
         oldDoc.put(sif.getName(), sif);
       }
+
     }
 
     cmd.solrDoc = oldDoc;
diff --git a/solr/core/src/test/org/apache/solr/update/TestUpdate.java b/solr/core/src/test/org/apache/solr/update/TestUpdate.java
index c63e2d876eb..4665b756807 100644
--- a/solr/core/src/test/org/apache/solr/update/TestUpdate.java
+++ b/solr/core/src/test/org/apache/solr/update/TestUpdate.java
@@ -159,6 +159,50 @@ public class TestUpdate extends SolrTestCaseJ4 {
       assertEquals(409, se.code());
     }
 
+    version = addAndGetVersion(sdoc("id","1", "val_i",5), null);
+    afterUpdate.call();
+
+    version = addAndGetVersion(sdoc("id","1",
+        "val_is",map("inc",1),
+        "val2_i",map("inc","1"),
+        "val2_f",map("inc",1),
+        "val2_d",map("inc","1.0"),
+        "val2_l",map("inc",1)
+        ),
+        null);
+    afterUpdate.call();
+
+    assertJQ(req("qt","/get", "id","1", "fl","id,val*")
+        ,"=={'doc':{'id':'1', 'val_i':5, 'val_is':[1], 'val2_i':1, 'val2_f':1.0, 'val2_d':1.0, 'val2_l':1}}"
+    );
+
+    version = addAndGetVersion(sdoc("id","1",
+        "val_is",map("inc","-5"),
+        "val2_i",map("inc",-5),
+        "val2_f",map("inc","-5.0"),
+        "val2_d",map("inc",-5),
+        "val2_l",map("inc","-5")
+    ),
+        null);
+    afterUpdate.call();
+
+    assertJQ(req("qt","/get", "id","1", "fl","id,val*")
+        ,"=={'doc':{'id':'1', 'val_i':5, 'val_is':[-4], 'val2_i':-4, 'val2_f':-4.0, 'val2_d':-4.0, 'val2_l':-4}}"
+    );
+
+    version = addAndGetVersion(sdoc("id","1",
+        "val_is",map("inc","2000000000"),
+        "val2_i",map("inc",-2000000000),
+        "val2_f",map("inc","1e+20"),
+        "val2_d",map("inc",-1.2345678901e+100),
+        "val2_l",map("inc","5000000000")
+    ),
+        null);
+    afterUpdate.call();
+
+    assertJQ(req("qt","/get", "id","1", "fl","id,val*")
+        ,"=={'doc':{'id':'1', 'val_i':5, 'val_is':[1999999996], 'val2_i':-2000000004, 'val2_f':1.0E20, 'val2_d':-1.2345678901e+100, 'val2_l':4999999996}}"
+    );
 
   }