diff --git a/cores/oak/OakParticle/OakParticle.cpp b/cores/oak/OakParticle/OakParticle.cpp
index a9a5eeb..0673e8f 100644
--- a/cores/oak/OakParticle/OakParticle.cpp
+++ b/cores/oak/OakParticle/OakParticle.cpp
@@ -7,14 +7,6 @@ using namespace particle_core;
 CloudClass::CloudClass(){
     spark_initConfig(false);
 }
-template<typename T>
-bool CloudClass::variable(const T *varKey, const String *userVar, const CloudVariableTypeString& userVarType)
-{
-    spark_variable_t extra;
-    extra.size = sizeof(extra);
-    extra.update = update_string_variable;
-    return CLOUD_FN(spark_variable(varKey, userVar, CloudVariableTypeString::value(), &extra), false);
-}
 
 bool CloudClass::function(const char *funcKey, user_function_int_str_t* func)
 {
diff --git a/cores/oak/OakParticle/OakParticle.h b/cores/oak/OakParticle/OakParticle.h
index 8f1acb9..8f5812f 100644
--- a/cores/oak/OakParticle/OakParticle.h
+++ b/cores/oak/OakParticle/OakParticle.h
@@ -118,7 +118,13 @@ class CloudClass : public Stream {
     }
 
     template<typename T>
-    static bool variable(const T *varKey, const String *userVar, const particle_core::CloudVariableTypeString& userVarType);
+    static inline bool variable(const T *varKey, const String *userVar, const particle_core::CloudVariableTypeString& userVarType)
+    {
+        particle_core::spark_variable_t extra;
+        extra.size = sizeof(extra);
+        extra.update = update_string_variable;
+        return CLOUD_FN(spark_variable(varKey, userVar, particle_core::CloudVariableTypeString::value(), &extra), false);
+    }
 
     template<typename T>
     static inline bool variable(const T *varKey, const String &userVar, const particle_core::CloudVariableTypeString& userVarType)