diff --git a/libopenage/renderer/demo/demo_1.cpp b/libopenage/renderer/demo/demo_1.cpp
index baa471b7b2..c28b7dc296 100644
--- a/libopenage/renderer/demo/demo_1.cpp
+++ b/libopenage/renderer/demo/demo_1.cpp
@@ -193,7 +193,7 @@ void renderer_demo_1(const util::Path &path) {
 			ssize_t y = qpos.y();
 
 			log::log(INFO << "Clicked at location (" << x << ", " << y << ")");
-			if (!texture_data_valid) {
+			if (not texture_data_valid) {
 				id_texture_data = id_texture->into_data();
 				texture_data_valid = true;
 			}
diff --git a/libopenage/renderer/demo/demo_2.cpp b/libopenage/renderer/demo/demo_2.cpp
index 1c92469bb5..c2a223d51b 100644
--- a/libopenage/renderer/demo/demo_2.cpp
+++ b/libopenage/renderer/demo/demo_2.cpp
@@ -248,7 +248,7 @@ void renderer_demo_2(const util::Path &path) {
 			ssize_t y = qpos.y();
 
 			log::log(INFO << "Clicked at location (" << x << ", " << y << ")");
-			if (!texture_data_valid) {
+			if (not texture_data_valid) {
 				id_texture_data = id_texture->into_data();
 				texture_data_valid = true;
 			}
diff --git a/libopenage/renderer/opengl/uniform_input.cpp b/libopenage/renderer/opengl/uniform_input.cpp
index 2be81e287f..e6caed4ca8 100644
--- a/libopenage/renderer/opengl/uniform_input.cpp
+++ b/libopenage/renderer/opengl/uniform_input.cpp
@@ -52,7 +52,7 @@ GlUniformBufferInput::GlUniformBufferInput(const std::shared_ptr<UniformBuffer>
 
 bool GlUniformInput::is_complete() const {
 	for (const auto &uniform : this->update_offs) {
-		if (!uniform.used) {
+		if (not uniform.used) {
 			return false;
 		}
 	}