diff --git a/miniwin/src/d3drm/backends/software/renderer.cpp b/miniwin/src/d3drm/backends/software/renderer.cpp
index 0833bdb5..8882098e 100644
--- a/miniwin/src/d3drm/backends/software/renderer.cpp
+++ b/miniwin/src/d3drm/backends/software/renderer.cpp
@@ -231,16 +231,21 @@ SDL_Color Direct3DRMSoftwareRenderer::ApplyLighting(
 		}
 		lightVec = Normalize(lightVec);
 
-		float dotNL = normal.x * lightVec.x + normal.y * lightVec.y + normal.z * lightVec.z;
+		float dotNL = DotProduct(normal, lightVec);
 		if (dotNL > 0.0f) {
 			// Diffuse contribution
 			diffuse.r += dotNL * lightColor.r;
 			diffuse.g += dotNL * lightColor.g;
 			diffuse.b += dotNL * lightColor.b;
 
-			if (appearance.shininess != 0.0f) {
-				// Using dotNL ignores view angle, but this matches DirectX 5 behavior.
-				float spec = std::pow(dotNL, appearance.shininess * m_shininessFactor);
+			// Specular
+			if (appearance.shininess > 0.0f && light.directional == 1.0f) {
+				D3DVECTOR viewVec = Normalize({-position.x, -position.y, -position.z});
+				D3DVECTOR H = Normalize({lightVec.x + viewVec.x, lightVec.y + viewVec.y, lightVec.z + viewVec.z});
+
+				float dotNH = std::max(DotProduct(normal, H), 0.0f);
+				float spec = std::pow(dotNH, appearance.shininess);
+
 				specular.r += spec * lightColor.r;
 				specular.g += spec * lightColor.g;
 				specular.b += spec * lightColor.b;
diff --git a/miniwin/src/d3drm/d3drmviewport.cpp b/miniwin/src/d3drm/d3drmviewport.cpp
index 3f60c368..c87866a7 100644
--- a/miniwin/src/d3drm/d3drmviewport.cpp
+++ b/miniwin/src/d3drm/d3drmviewport.cpp
@@ -595,11 +595,6 @@ bool RayIntersectsBox(const Ray& ray, const D3DRMBOX& box, float& outT)
 	return true;
 }
 
-inline float DotProduct(const D3DVECTOR& a, const D3DVECTOR& b)
-{
-	return a.x * b.x + a.y * b.y + a.z * b.z;
-}
-
 // Convert screen (x,y) in viewport to picking ray in world space
 Ray BuildPickingRay(
 	float x,
diff --git a/miniwin/src/internal/mathutils.h b/miniwin/src/internal/mathutils.h
index 460a7156..4a8588e9 100644
--- a/miniwin/src/internal/mathutils.h
+++ b/miniwin/src/internal/mathutils.h
@@ -25,6 +25,11 @@ inline D3DVECTOR Normalize(const D3DVECTOR& v)
 	return {0, 0, 0};
 }
 
+inline float DotProduct(const D3DVECTOR& a, const D3DVECTOR& b)
+{
+	return a.x * b.x + a.y * b.y + a.z * b.z;
+}
+
 inline D3DVECTOR CrossProduct(const D3DVECTOR& a, const D3DVECTOR& b)
 {
 	return {a.y * b.z - a.z * b.y, a.z * b.x - a.x * b.z, a.x * b.y - a.y * b.x};