diff --git a/erpcgen/src/templates/c_coders.template b/erpcgen/src/templates/c_coders.template
index 09d2b4d0..028bc1e7 100644
--- a/erpcgen/src/templates/c_coders.template
+++ b/erpcgen/src/templates/c_coders.template
@@ -3,13 +3,13 @@
 uint32_t {$info.stringLocalName}_len;
 char * {$info.stringLocalName}_local;
 codec->readString(&{$info.stringLocalName}_len, &{$info.stringLocalName}_local);
-{%  if info.stringAllocSize != info.stringLocalName + "_len" %}
+{%  if info.stringAllocSize != info.stringLocalName & "_len" %}
 if ({$info.stringLocalName}_len <= {$info.stringAllocSize})
 {
 {%   set indent = "    " >%}
 {% else %}
 {%   set indent = "" >%}
-{% endif  -- if info.stringAllocSize != info.stringLocalName + "_len" %}
+{% endif  -- if info.stringAllocSize != info.stringLocalName & "_len" %}
 {%  if ((source == "client" && info.withoutAlloc == false) or source == "server") %}
 {$indent}{$info.name} = ({$info.builtinTypeName}) erpc_malloc(({$info.stringAllocSize} + 1) * sizeof(char));
 {%   if generateAllocErrorChecks == true %}
@@ -26,13 +26,13 @@ if ({$info.stringLocalName}_len <= {$info.stringAllocSize})
 {%  if (((source == "client" && info.withoutAlloc == false) or source == "server") && generateAllocErrorChecks == true) %}
 {$indent}}
 {%  endif -- withoutAlloc && generateAllocErrorChecks %}
-{%  if info.stringAllocSize != info.stringLocalName + "_len" %}
+{%  if info.stringAllocSize != info.stringLocalName & "_len" %}
 }
 else
 {
     codec->updateStatus(kErpcStatus_InvalidArgument);
 }
-{% endif  -- if info.stringAllocSize != info.stringLocalName + "_len" %}
+{% endif  -- if info.stringAllocSize != info.stringLocalName & "_len" %}
 {% else %}
 {%  if source == "client" && info.pointerScalarTypes %}
 codec->read({$info.name});
@@ -243,7 +243,7 @@ codec->readData({$info.name}, {$info.sizeTemp} * sizeof({$info.builtinTypeName})
 {% def encodeBuiltinType(info) -----------------  %}
 {% if info.builtinType == "kStringType" %}
 uint32_t {$info.stringLocalName}_len = strlen((const char*){$info.name});
-{% if info.stringAllocSize != info.stringLocalName + "_len"  %}
+{% if info.stringAllocSize != info.stringLocalName & "_len"  %}
 
 {% if source == "server" %}
 erpc_assert({$info.stringLocalName}_len <= {$info.stringAllocSize});
@@ -269,7 +269,7 @@ codec->write({$info.name});
 {% def encodeBinaryType(info) -----------------  %}
 {% if info.size != info.maxSize %}
 {% if source == "server" %}
-erpc_assert({$info.size} <= {$info.maxSize} * sizeof({$info.mallocSizeType}));
+erpc_assert({$info.sizeTemp} <= {$info.maxSize} * sizeof({$info.mallocSizeType}));
 
 {%  else %}
 if ({% if info.pointerScalarTypes %}*{% endif %}{$info.size} > {$info.maxSize})