diff --git a/CMakeLists.txt b/CMakeLists.txt
index 23da468..89c6361 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -29,6 +29,7 @@ set(docopt_HEADERS
 		docopt_private.h
 		docopt_util.h
 		docopt_value.h
+		docopt_api.h
 		)
 
 #============================================================================
diff --git a/appveyor.yml b/appveyor.yml
new file mode 100644
index 0000000..4c81b4c
--- /dev/null
+++ b/appveyor.yml
@@ -0,0 +1,16 @@
+skip_tags: true
+
+environment:
+  PYTHON: C:\\Python27-x64
+  APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2017
+
+install:
+  - set PATH=%PYTHON%;%PYTHON%\\Scripts\\;%PATH%
+
+build: false
+
+build_script:
+  - mkdir build && cd build
+  - cmake -G "Visual Studio 15 2017 Win64" ..
+  - cmake --build . --config Debug
+
diff --git a/docopt.h b/docopt.h
index 4c40741..e4d494e 100644
--- a/docopt.h
+++ b/docopt.h
@@ -9,37 +9,13 @@
 #ifndef docopt__docopt_h_
 #define docopt__docopt_h_
 
+#include "docopt_api.h"
 #include "docopt_value.h"
 
 #include <map>
 #include <vector>
 #include <string>
 
-#ifdef DOCOPT_HEADER_ONLY
-    #define DOCOPT_INLINE inline
-    #define DOCOPT_API
-#else 
-    #define DOCOPT_INLINE
-
-    // With Microsoft Visual Studio, export certain symbols so they 
-    // are available to users of docopt.dll (shared library). The DOCOPT_DLL
-    // macro should be defined if building a DLL (with Visual Studio),
-    // and by clients using the DLL. The CMakeLists.txt and the
-    // docopt-config.cmake it generates handle this.
-    #ifdef DOCOPT_DLL
-        // Whoever is *building* the DLL should define DOCOPT_EXPORTS.
-        // The CMakeLists.txt that comes with docopt does this.
-        // Clients of docopt.dll should NOT define DOCOPT_EXPORTS.
-        #ifdef DOCOPT_EXPORTS
-            #define DOCOPT_API __declspec(dllexport)
-        #else
-            #define DOCOPT_API __declspec(dllimport)
-        #endif
-    #else
-        #define DOCOPT_API
-    #endif
-#endif
-
 namespace docopt {
 	
 	// Usage string could not be parsed (ie, the developer did something wrong)
@@ -67,7 +43,8 @@ namespace docopt {
 	/// @throws DocoptExitHelp if 'help' is true and the user has passed the '--help' argument
 	/// @throws DocoptExitVersion if 'version' is true and the user has passed the '--version' argument
 	/// @throws DocoptArgumentError if the user's argv did not match the usage patterns
-	std::map<std::string, value> DOCOPT_API docopt_parse(std::string const& doc,
+	DOCOPT_API
+	std::map<std::string, value> docopt_parse(std::string const& doc,
 					    std::vector<std::string> const& argv,
 					    bool help = true,
 					    bool version = true,
@@ -80,7 +57,8 @@ namespace docopt {
 	///  * DocoptExitHelp - print usage string and terminate (with exit code 0)
 	///  * DocoptExitVersion - print version and terminate (with exit code 0)
 	///  * DocoptArgumentError - print error and usage string and terminate (with exit code -1)
-	std::map<std::string, value> DOCOPT_API docopt(std::string const& doc,
+	DOCOPT_API
+	std::map<std::string, value> docopt(std::string const& doc,
 					    std::vector<std::string> const& argv,
 					    bool help = true,
 					    std::string const& version = {},
diff --git a/docopt_api.h b/docopt_api.h
new file mode 100644
index 0000000..8d774e9
--- /dev/null
+++ b/docopt_api.h
@@ -0,0 +1,35 @@
+//
+//  docopt_api.h
+//  docopt
+//
+//
+
+#ifndef docopt__api_h_
+#define docopt__api_h_
+
+#ifdef DOCOPT_HEADER_ONLY
+    #define DOCOPT_INLINE inline
+    #define DOCOPT_API
+#else 
+    #define DOCOPT_INLINE
+
+    // With Microsoft Visual Studio, export certain symbols so they 
+    // are available to users of docopt.dll (shared library). The DOCOPT_DLL
+    // macro should be defined if building a DLL (with Visual Studio),
+    // and by clients using the DLL. The CMakeLists.txt and the
+    // docopt-config.cmake it generates handle this.
+    #ifdef DOCOPT_DLL
+        // Whoever is *building* the DLL should define DOCOPT_EXPORTS.
+        // The CMakeLists.txt that comes with docopt does this.
+        // Clients of docopt.dll should NOT define DOCOPT_EXPORTS.
+        #ifdef DOCOPT_EXPORTS
+            #define DOCOPT_API __declspec(dllexport)
+        #else
+            #define DOCOPT_API __declspec(dllimport)
+        #endif
+    #else
+        #define DOCOPT_API
+    #endif
+#endif
+
+#endif /* defined(docopt__api_h_) */
\ No newline at end of file
diff --git a/docopt_value.h b/docopt_value.h
index 829ee55..ce7f280 100644
--- a/docopt_value.h
+++ b/docopt_value.h
@@ -9,6 +9,8 @@
 #ifndef docopt__value_h_
 #define docopt__value_h_
 
+#include "docopt_api.h"
+
 #include <stdexcept>
 #include <string>
 #include <vector>
@@ -105,7 +107,7 @@ namespace docopt {
 	};
 
 	/// Write out the contents to the ostream
-	std::ostream& operator<<(std::ostream&, value const&);
+	DOCOPT_API std::ostream& operator<<(std::ostream&, value const&);
 }
 
 namespace std {