diff --git a/renderdoc/driver/gl/gl_driver.cpp b/renderdoc/driver/gl/gl_driver.cpp
index 2144b1f90..cd5ef832a 100644
--- a/renderdoc/driver/gl/gl_driver.cpp
+++ b/renderdoc/driver/gl/gl_driver.cpp
@@ -1845,7 +1845,7 @@ void WrappedOpenGL::RenderOverlayStr(float x, float y, const char *text)
     }
     else
     {
-      gl.glViewport(0.0f, 0.0f, (float)m_InitParams.width, (float)m_InitParams.height);
+      gl.glViewport(0, 0, m_InitParams.width, m_InitParams.height);
       gl.glDisable(eGL_SCISSOR_TEST);
     }
     gl.glPolygonMode(eGL_FRONT_AND_BACK, eGL_FILL);
diff --git a/renderdoc/driver/gl/gl_renderstate.cpp b/renderdoc/driver/gl/gl_renderstate.cpp
index 47913f4eb..08e5d80f6 100644
--- a/renderdoc/driver/gl/gl_renderstate.cpp
+++ b/renderdoc/driver/gl/gl_renderstate.cpp
@@ -1294,7 +1294,8 @@ void GLRenderState::ApplyState(void *ctx, WrappedOpenGL *gl)
   }
   else
   {
-    m_Real->glViewport(Viewports[0].x, Viewports[0].y, Viewports[0].width, Viewports[0].height);
+    m_Real->glViewport((GLint)Viewports[0].x, (GLint)Viewports[0].y, (GLsizei)Viewports[0].width,
+                       (GLsizei)Viewports[0].height);
 
     m_Real->glScissor(Scissors[0].x, Scissors[0].y, Scissors[0].width, Scissors[0].height);