diff --git a/GPU/Directx9/ShaderManagerDX9.cpp b/GPU/Directx9/ShaderManagerDX9.cpp
index 8874b325c5..0ee849b940 100644
--- a/GPU/Directx9/ShaderManagerDX9.cpp
+++ b/GPU/Directx9/ShaderManagerDX9.cpp
@@ -485,10 +485,10 @@ void ShaderManagerDX9::VSUpdateUniforms(int dirtyUniforms) {
 
 		// Adjust for D3D projection matrix. We got squashed up to only 0-1, so we multiply
 		// the scale factor by 2, and add an offset.
-		// Given the way we do the rounding, the offset is probably mostly irrelevant as we cancel
+		// Given the way we do the rounding, the integer part of the offset is probably mostly irrelevant as we cancel
 		// it afterwards anyway.
 		viewZScale *= 2.0f;
-		viewZCenter -= 32768.0f;
+		viewZCenter -= 32767.5f;
 		float viewZInvScale;
 		if (viewZScale != 0.0) {
 			viewZInvScale = 1.0f / viewZScale;
diff --git a/GPU/Directx9/StateMappingDX9.cpp b/GPU/Directx9/StateMappingDX9.cpp
index f67f05d694..e671a2df8b 100644
--- a/GPU/Directx9/StateMappingDX9.cpp
+++ b/GPU/Directx9/StateMappingDX9.cpp
@@ -749,8 +749,8 @@ void TransformDrawEngineDX9::ApplyDrawState(int prim) {
 		// That variable is only check for sign later so the multiplication by 2 isn't really necessary.
 
 		// It's unclear why we need this Z offset of 1 to match OpenGL, but this checks out in multiple games.
-		float depthRangeMin = zCenter - fabsf(zScale) - 1.0f/65535.0f;
-		float depthRangeMax = zCenter + fabsf(zScale) - 1.0f/65535.0f;
+		float depthRangeMin = zCenter - fabsf(zScale) - 0.5f/65535.0f;
+		float depthRangeMax = zCenter + fabsf(zScale) - 0.5f/65535.0f;
 		gstate_c.vpDepth = zScale * 2;
 
 		// D3D doesn't like viewports partially outside the target, so we