diff --git a/change_log.txt b/change_log.txt
index 5fd4bf9c..2bbe3879 100644
--- a/change_log.txt
+++ b/change_log.txt
@@ -1,4 +1,7 @@
  ===== 3.1.24.dev ===== (xx.xx.2015)
+ 19.05.2015
+  - bugfix compiler did overwrite existing variable value when setting the nocache attribute https://github.com/smarty-php/smarty/issues/39
+
  18.05.2015
   - improvement introduce shortcuts in lexer/parser rules for most frequent terms for higher
     compilation speed 
diff --git a/libs/sysplugins/smarty_internal_compile_if.php b/libs/sysplugins/smarty_internal_compile_if.php
index 71d3d4af..d4fd30e9 100644
--- a/libs/sysplugins/smarty_internal_compile_if.php
+++ b/libs/sysplugins/smarty_internal_compile_if.php
@@ -42,9 +42,14 @@ class Smarty_Internal_Compile_If extends Smarty_Internal_CompileBase
                 $_nocache = ',true';
                 // create nocache var to make it know for further compiling
                 if (is_array($parameter['if condition']['var'])) {
-                    $compiler->template->tpl_vars[trim($parameter['if condition']['var']['var'], "'")] = new Smarty_Variable(null, true);
+                    $var = trim($parameter['if condition']['var']['var'], "'");
                 } else {
-                    $compiler->template->tpl_vars[trim($parameter['if condition']['var'], "'")] = new Smarty_Variable(null, true);
+                    $var = trim($parameter['if condition']['var'], "'");
+                 }
+                if (isset($compiler->template->tpl_vars[$var])) {
+                    $compiler->template->tpl_vars[$var]->nocache = true;
+                } else {
+                    $compiler->template->tpl_vars[$var] = new Smarty_Variable(null, true);
                 }
             } else {
                 $_nocache = '';
@@ -124,9 +129,14 @@ class Smarty_Internal_Compile_Elseif extends Smarty_Internal_CompileBase
                 $_nocache = ',true';
                 // create nocache var to make it know for further compiling
                 if (is_array($parameter['if condition']['var'])) {
-                    $compiler->template->tpl_vars[trim($parameter['if condition']['var']['var'], "'")] = new Smarty_Variable(null, true);
+                    $var = trim($parameter['if condition']['var']['var'], "'");
                 } else {
-                    $compiler->template->tpl_vars[trim($parameter['if condition']['var'], "'")] = new Smarty_Variable(null, true);
+                    $var = trim($parameter['if condition']['var'], "'");
+                }
+                if (isset($compiler->template->tpl_vars[$var])) {
+                    $compiler->template->tpl_vars[$var]->nocache = true;
+                } else {
+                    $compiler->template->tpl_vars[$var] = new Smarty_Variable(null, true);
                 }
             } else {
                 $_nocache = '';
diff --git a/libs/sysplugins/smarty_internal_compile_insert.php b/libs/sysplugins/smarty_internal_compile_insert.php
index 659b3f12..57f27350 100644
--- a/libs/sysplugins/smarty_internal_compile_insert.php
+++ b/libs/sysplugins/smarty_internal_compile_insert.php
@@ -68,7 +68,12 @@ class Smarty_Internal_Compile_Insert extends Smarty_Internal_CompileBase
             // output will be stored in a smarty variable instead of being displayed
             $_assign = $_attr['assign'];
             // create variable to make sure that the compiler knows about its nocache status
-            $compiler->template->tpl_vars[trim($_attr['assign'], "'")] = new Smarty_Variable(null, true);
+            $var = trim($_attr['assign'], "'");
+            if (isset($compiler->template->tpl_vars[$var])) {
+                $compiler->template->tpl_vars[$var]->nocache = true;
+            } else {
+                $compiler->template->tpl_vars[$var] = new Smarty_Variable(null, true);
+            }
         }
         if (isset($_attr['script'])) {
             // script which must be included
diff --git a/libs/sysplugins/smarty_internal_compile_while.php b/libs/sysplugins/smarty_internal_compile_while.php
index b73602f3..6a6fb3ef 100644
--- a/libs/sysplugins/smarty_internal_compile_while.php
+++ b/libs/sysplugins/smarty_internal_compile_while.php
@@ -42,9 +42,14 @@ class Smarty_Internal_Compile_While extends Smarty_Internal_CompileBase
                 $_nocache = ',true';
                 // create nocache var to make it know for further compiling
                 if (is_array($parameter['if condition']['var'])) {
-                    $compiler->template->tpl_vars[trim($parameter['if condition']['var']['var'], "'")] = new Smarty_Variable(null, true);
+                    $var = trim($parameter['if condition']['var']['var'], "'");
                 } else {
-                    $compiler->template->tpl_vars[trim($parameter['if condition']['var'], "'")] = new Smarty_Variable(null, true);
+                    $var = trim($parameter['if condition']['var'], "'");
+                }
+                if (isset($compiler->template->tpl_vars[$var])) {
+                    $compiler->template->tpl_vars[$var]->nocache = true;
+                } else {
+                    $compiler->template->tpl_vars[$var] = new Smarty_Variable(null, true);
                 }
             } else {
                 $_nocache = '';