diff --git a/libraries/gl/src/gl/GLShaders.h b/libraries/gl/src/gl/GLShaders.h
index 9a0d67af0c..26dd089370 100644
--- a/libraries/gl/src/gl/GLShaders.h
+++ b/libraries/gl/src/gl/GLShaders.h
@@ -17,9 +17,9 @@
 
 namespace gl {
 #ifdef SEPARATE_PROGRAM
-    bool compileShader(GLenum shaderDomain, const std::string& shaderSource, const std::string& defines, GLuint &shaderObject, GLuint &programObject, std::string& error = std::string());
+    bool compileShader(GLenum shaderDomain, const std::string& shaderSource, const std::string& defines, GLuint &shaderObject, GLuint &programObject, std::string& error);
 #else
-    bool compileShader(GLenum shaderDomain, const std::string& shaderSource, const std::string& defines, GLuint &shaderObject, std::string& error = std::string());
+    bool compileShader(GLenum shaderDomain, const std::string& shaderSource, const std::string& defines, GLuint &shaderObject, std::string& error);
 #endif
 
     GLuint compileProgram(const std::vector<GLuint>& glshaders, std::string& error = std::string());
diff --git a/libraries/render/src/render/DrawTask.cpp b/libraries/render/src/render/DrawTask.cpp
index 59d291b9e0..ca3f856efc 100755
--- a/libraries/render/src/render/DrawTask.cpp
+++ b/libraries/render/src/render/DrawTask.cpp
@@ -165,7 +165,7 @@ void DrawBounds::run(const SceneContextPointer& sceneContext, const RenderContex
     const Inputs& items) {
     RenderArgs* args = renderContext->args;
 
-    auto numItems = items.size();
+    uint32_t numItems = (uint32_t) items.size();
     if (numItems == 0) {
         return;
     }
diff --git a/plugins/openvr/src/OpenVrDisplayPlugin.cpp b/plugins/openvr/src/OpenVrDisplayPlugin.cpp
index 1adfa8d333..b41cdaf181 100644
--- a/plugins/openvr/src/OpenVrDisplayPlugin.cpp
+++ b/plugins/openvr/src/OpenVrDisplayPlugin.cpp
@@ -196,8 +196,9 @@ public:
             std::string vsSource = HMD_REPROJECTION_VERT;
             std::string fsSource = HMD_REPROJECTION_FRAG;
             GLuint vertexShader { 0 }, fragmentShader { 0 };
-            ::gl::compileShader(GL_VERTEX_SHADER, vsSource, "", vertexShader);
-            ::gl::compileShader(GL_FRAGMENT_SHADER, fsSource, "", fragmentShader);
+            std::string error;
+            ::gl::compileShader(GL_VERTEX_SHADER, vsSource, "", vertexShader, error);
+            ::gl::compileShader(GL_FRAGMENT_SHADER, fsSource, "", fragmentShader, error);
             _program = ::gl::compileProgram({ { vertexShader, fragmentShader } });
             glDeleteShader(vertexShader);
             glDeleteShader(fragmentShader);