diff --git a/src/gl/models/gl_models.cpp b/src/gl/models/gl_models.cpp
index 0d3754b7f..f6ee0e936 100644
--- a/src/gl/models/gl_models.cpp
+++ b/src/gl/models/gl_models.cpp
@@ -157,7 +157,7 @@ void FGLModelRenderer::DrawElements(int numIndices, size_t offset)
 
 double FGLModelRenderer::GetTimeFloat()
 {
-	return (float)I_msTime() * (float)TICRATE / 1000.0f;
+	return (double)I_msTime() * (double)TICRATE / 1000.;
 }
 
 //===========================================================================
diff --git a/src/gl/renderer/gl_renderstate.cpp b/src/gl/renderer/gl_renderstate.cpp
index 6dd78d593..2405aff09 100644
--- a/src/gl/renderer/gl_renderstate.cpp
+++ b/src/gl/renderer/gl_renderstate.cpp
@@ -173,7 +173,7 @@ bool FRenderState::ApplyShader()
 	activeShader->muInterpolationFactor.Set(mInterpolationFactor);
 	activeShader->muClipHeight.Set(mClipHeight);
 	activeShader->muClipHeightDirection.Set(mClipHeightDirection);
-	activeShader->muTimer.Set((double)(screen->FrameTime - firstFrame) * mShaderTimer / 1000.f);
+	activeShader->muTimer.Set((double)(screen->FrameTime - firstFrame) * (double)mShaderTimer / 1000.);
 	activeShader->muAlphaThreshold.Set(mAlphaThreshold);
 	activeShader->muLightIndex.Set(mLightIndex);	// will always be -1 for now
 	activeShader->muClipSplit.Set(mClipSplit);