diff --git a/src/main/java/com/github/sommeri/less4j/core/compiler/selectors/ExtendsSolver.java b/src/main/java/com/github/sommeri/less4j/core/compiler/selectors/ExtendsSolver.java
index d9b1327f..58261bc6 100644
--- a/src/main/java/com/github/sommeri/less4j/core/compiler/selectors/ExtendsSolver.java
+++ b/src/main/java/com/github/sommeri/less4j/core/compiler/selectors/ExtendsSolver.java
@@ -97,6 +97,19 @@ private ASTCssNode findOwnerNode(ASTCssNode extendingSelector) {
   private void addSelector(RuleSet ruleSet, Selector selector) {
     selector.setParent(ruleSet);
     ruleSet.addSelector(selector);
+    setVisibility(ruleSet, selector);
+  }
+
+  private void setVisibility(RuleSet ruleSet, Selector newSelector) {
+    if (newSelector.isSilent() || !ruleSet.isSilent())
+      return ;
+    ruleSet.setSilent(false);
+
+    List<? extends ASTCssNode> childs = ruleSet.getChilds();
+    childs.removeAll(ruleSet.getSelectors());
+    for (ASTCssNode kid : childs) {
+      manipulator.setTreeSilentness(kid, false);
+    }
   }
 
   private Selector constructNewSelector(Selector extending, Selector possibleTarget) {
@@ -106,17 +119,22 @@ private Selector constructNewSelector(Selector extending, Selector possibleTarge
     List<Extend> allExtends = extending.getExtend();
     for (Extend extend : allExtends) {
       if (!extend.isAll() && comparator.equals(possibleTarget, extend.getTarget())) 
-        return extending.clone();
+        return setNewSelectorVisibility(extend, extending.clone());
       
       if (extend.isAll()) {
         Selector addSelector = comparator.replaceInside(extend.getTarget(), possibleTarget, extend.getParentAsSelector());
         if (addSelector!=null)
-          return addSelector;
+          return setNewSelectorVisibility(extend, addSelector);
       }
     }
     return null;
   }
 
+  private Selector setNewSelectorVisibility(Extend extend, Selector newSelector) {
+    manipulator.setTreeSilentness(newSelector, extend.isSilent());
+    return newSelector;
+  }
+
   private void collectRulesets(ASTCssNode node) {
     switch (node.getType()) {
     case RULE_SET: {
diff --git a/src/main/java/com/github/sommeri/less4j/utils/CssPrinter.java b/src/main/java/com/github/sommeri/less4j/utils/CssPrinter.java
index a1b02b3b..6d103993 100644
--- a/src/main/java/com/github/sommeri/less4j/utils/CssPrinter.java
+++ b/src/main/java/com/github/sommeri/less4j/utils/CssPrinter.java
@@ -1,5 +1,6 @@
 package com.github.sommeri.less4j.utils;
 
+import java.util.ArrayList;
 import java.util.Iterator;
 import java.util.List;
 
@@ -860,6 +861,7 @@ private boolean appendNumberExpression(NumberExpression node) {
   }
 
   public void appendSelectors(List<Selector> selectors) {
+    selectors = filterSilent(selectors);
     // follow less.js formatting in special case - only one empty selector
     if (selectors.size() == 1 && isEmptySelector(selectors.get(0))) {
       cssOnly.append(" ");
@@ -875,6 +877,15 @@ public void appendSelectors(List<Selector> selectors) {
     }
   }
 
+  private <T  extends ASTCssNode> List<T> filterSilent(List<T> nodes) {
+    List<T> result = new ArrayList<T>();
+    for (T t : nodes) {
+      if (!t.isSilent())
+        result.add(t);
+    }
+    return result;
+  }
+
   private boolean isEmptySelector(Selector selector) {
     if (selector.isCombined())
       return false;
diff --git a/src/test/resources/compile-basic-features/import/import-option-reference-extend-lessjs-1851.css b/src/test/resources/compile-basic-features/import/import-option-reference-extend-lessjs-1851.css
new file mode 100644
index 00000000..36f3949e
--- /dev/null
+++ b/src/test/resources/compile-basic-features/import/import-option-reference-extend-lessjs-1851.css
@@ -0,0 +1,6 @@
+.test-c {
+  color: red;
+}
+.test-c {
+  background-color: green;
+}
\ No newline at end of file
diff --git a/src/test/resources/compile-basic-features/import/import-option-reference-extend-lessjs-1851.less b/src/test/resources/compile-basic-features/import/import-option-reference-extend-lessjs-1851.less
new file mode 100644
index 00000000..08dac3d4
--- /dev/null
+++ b/src/test/resources/compile-basic-features/import/import-option-reference-extend-lessjs-1851.less
@@ -0,0 +1,6 @@
+//This one tests reference chaining 
+@import (reference) "import/extend-lessjs-1851-fileB.less";
+
+.test-c {
+  &:extend(.test-b all);
+}
diff --git a/src/test/resources/compile-basic-features/import/import-options-reference-extend.css b/src/test/resources/compile-basic-features/import/import-options-reference-extend.css
new file mode 100644
index 00000000..f70a4c32
--- /dev/null
+++ b/src/test/resources/compile-basic-features/import/import-options-reference-extend.css
@@ -0,0 +1,9 @@
+.mainExtendingReference {
+  imported-as: reference;
+}
+.mainRuleset {
+  main: ruleset;
+}
+.mainExtendingReference {
+  main-extending: in main;
+}
\ No newline at end of file
diff --git a/src/test/resources/compile-basic-features/import/import-options-reference-extend.less b/src/test/resources/compile-basic-features/import/import-options-reference-extend.less
new file mode 100644
index 00000000..eb6fd240
--- /dev/null
+++ b/src/test/resources/compile-basic-features/import/import-options-reference-extend.less
@@ -0,0 +1,8 @@
+@import (reference) "import/import-as-reference-extend.less";
+.mainRuleset {
+	main: ruleset;
+}
+
+.mainExtendingReference:extend(.importedAsReference) {
+	main-extending: in main;
+}
\ No newline at end of file
diff --git a/src/test/resources/compile-basic-features/import/import-reference-lessjs.css b/src/test/resources/compile-basic-features/import/import-options-reference-lessjs.css
similarity index 79%
rename from src/test/resources/compile-basic-features/import/import-reference-lessjs.css
rename to src/test/resources/compile-basic-features/import/import-options-reference-lessjs.css
index c2d055a7..f8433bce 100644
--- a/src/test/resources/compile-basic-features/import/import-reference-lessjs.css
+++ b/src/test/resources/compile-basic-features/import/import-options-reference-lessjs.css
@@ -1,7 +1,3 @@
-/*
-  The media statement above is invalid (no selector)
-  We should ban invalid media queries with properties and no selector?
-*/
 .visible {
   color: red;
 }
@@ -48,8 +44,7 @@
 }
 .y {
   pulled-in: yes;
-}
-/* comment pulled in */
+} /* comment pulled in */
 .visible {
   extend: test;
 }
diff --git a/src/test/resources/compile-basic-features/import/import-options-reference-lessjs.less b/src/test/resources/compile-basic-features/import/import-options-reference-lessjs.less
new file mode 100644
index 00000000..c83c691d
--- /dev/null
+++ b/src/test/resources/compile-basic-features/import/import-options-reference-lessjs.less
@@ -0,0 +1,18 @@
+//@import (reference) url("reference-lessjs/import-once.less");
+//@import (reference) url("reference-lessjs/css-3.less");
+@import (reference) url("reference-lessjs/media.less");
+/*
+  The media statement above is invalid (no selector)
+  We should ban invalid media queries with properties and no selector?
+*/
+@import (reference) url("reference-lessjs/import-reference.less");
+
+.b {
+  .z();
+}
+
+.zz();
+
+.visible:extend(.z all) {
+  extend: test;
+}
\ No newline at end of file
diff --git a/src/test/resources/compile-basic-features/import/import/extend-lessjs-1851-fileA.less b/src/test/resources/compile-basic-features/import/import/extend-lessjs-1851-fileA.less
new file mode 100644
index 00000000..1a036187
--- /dev/null
+++ b/src/test/resources/compile-basic-features/import/import/extend-lessjs-1851-fileA.less
@@ -0,0 +1,3 @@
+.test-a {
+  color: red;
+}
\ No newline at end of file
diff --git a/src/test/resources/compile-basic-features/import/import/extend-lessjs-1851-fileB.less b/src/test/resources/compile-basic-features/import/import/extend-lessjs-1851-fileB.less
new file mode 100644
index 00000000..659cfd72
--- /dev/null
+++ b/src/test/resources/compile-basic-features/import/import/extend-lessjs-1851-fileB.less
@@ -0,0 +1,6 @@
+@import (reference) "extend-lessjs-1851-fileA.less";
+
+.test-b {
+  background-color: green;
+  &:extend(.test-a all);
+}
\ No newline at end of file
diff --git a/src/test/resources/compile-basic-features/import/import/import-as-reference-extend.less b/src/test/resources/compile-basic-features/import/import/import-as-reference-extend.less
new file mode 100644
index 00000000..a9518b9a
--- /dev/null
+++ b/src/test/resources/compile-basic-features/import/import/import-as-reference-extend.less
@@ -0,0 +1,6 @@
+.importedAsReference {
+	imported-as: reference;
+}
+.unusedAndReference:extend(.mainRuleset) {
+	unused-and: reference;
+}
\ No newline at end of file