diff --git a/src/4.advanced_opengl/2.stencil_testing/stencil_testing.cpp b/src/4.advanced_opengl/2.stencil_testing/stencil_testing.cpp
index db600d2..4a7a85f 100644
--- a/src/4.advanced_opengl/2.stencil_testing/stencil_testing.cpp
+++ b/src/4.advanced_opengl/2.stencil_testing/stencil_testing.cpp
@@ -170,7 +170,7 @@ int main()
     // shader configuration
     // --------------------
     shader.use();
-    shader.setInt("ourTexture", 0);
+    shader.setInt("texture1", 0);
 
     // render loop
     // -----------
@@ -243,12 +243,12 @@ int main()
         model = glm::mat4();
         model = glm::translate(model, glm::vec3(-1.0f, 0.0f, -1.0f));
         model = glm::scale(model, glm::vec3(scale, scale, scale));
-        shader.setMat4("model", model);
+        shaderSingleColor.setMat4("model", model);
         glDrawArrays(GL_TRIANGLES, 0, 36);
         model = glm::mat4();
         model = glm::translate(model, glm::vec3(2.0f, 0.0f, 0.0f));
         model = glm::scale(model, glm::vec3(scale, scale, scale));
-        shader.setMat4("model", model);
+        shaderSingleColor.setMat4("model", model);
         glDrawArrays(GL_TRIANGLES, 0, 36);
         glBindVertexArray(0);
         glStencilMask(0xFF);
diff --git a/src/5.advanced_lighting/8.2.deferred_shading_volumes/deferred_shading_volumes.cpp b/src/5.advanced_lighting/8.2.deferred_shading_volumes/deferred_shading_volumes.cpp
index e7c4b5e..75c0c4e 100644
--- a/src/5.advanced_lighting/8.2.deferred_shading_volumes/deferred_shading_volumes.cpp
+++ b/src/5.advanced_lighting/8.2.deferred_shading_volumes/deferred_shading_volumes.cpp
@@ -224,7 +224,7 @@ int main()
             shaderLightingPass.setFloat("lights[" + std::to_string(i) + "].Quadratic", quadratic);
             // then calculate radius of light volume/sphere
             const float maxBrightness = std::fmaxf(std::fmaxf(lightColors[i].r, lightColors[i].g), lightColors[i].b);
-            float radius = (-linear + std::sqrtf(linear * linear - 4 * quadratic * (constant - (256.0f / 5.0f) * maxBrightness))) / (2.0f * quadratic);
+            float radius = (-linear + std::sqrt(linear * linear - 4 * quadratic * (constant - (256.0f / 5.0f) * maxBrightness))) / (2.0f * quadratic);
             shaderLightingPass.setFloat("lights[" + std::to_string(i) + "].Radius", radius);
         }
         shaderLightingPass.setVec3("viewPos", camera.Position);