diff --git a/libs/freetdm/msvc/openzap.vcproj b/libs/freetdm/msvc/openzap.vcproj
index 84fe2d134b..f677bc216b 100644
--- a/libs/freetdm/msvc/openzap.vcproj
+++ b/libs/freetdm/msvc/openzap.vcproj
@@ -41,7 +41,7 @@
 			<Tool
 				Name="VCCLCompilerTool"
 				Optimization="0"
-				AdditionalIncludeDirectories="../src/include;../src/isdn/include"
+				AdditionalIncludeDirectories="../src/include;../src/isdn/include;../src/dsp"
 				PreprocessorDefinitions="WIN32;_DEBUG;_LIB"
 				MinimalRebuild="true"
 				BasicRuntimeChecks="3"
@@ -109,7 +109,7 @@
 			/>
 			<Tool
 				Name="VCCLCompilerTool"
-				AdditionalIncludeDirectories="../src/include;../src/isdn/include"
+				AdditionalIncludeDirectories="../src/include;../src/isdn/include;../src/dsp"
 				PreprocessorDefinitions="WIN32;NDEBUG;_LIB"
 				RuntimeLibrary="2"
 				DisableLanguageExtensions="false"
diff --git a/libs/freetdm/src/include/zap_types.h b/libs/freetdm/src/include/zap_types.h
index 6e4c8c1e0e..d77f56cf98 100644
--- a/libs/freetdm/src/include/zap_types.h
+++ b/libs/freetdm/src/include/zap_types.h
@@ -40,7 +40,12 @@
 typedef HANDLE zap_socket_t;
 typedef unsigned __int64 uint64_t;
 typedef unsigned __int32 uint32_t;
+typedef unsigned __int16 uint16_t;
+typedef unsigned __int8 uint8_t;
+typedef __int64 int64_t;
 typedef __int32 int32_t;
+typedef __int16 int16_t;
+typedef __int8 int8_t;
 typedef intptr_t zap_ssize_t;
 typedef int zap_filehandle_t;
 #else