diff --git a/core/string/ustring.cpp b/core/string/ustring.cpp
index 4c439c92e..263d7ec28 100644
--- a/core/string/ustring.cpp
+++ b/core/string/ustring.cpp
@@ -3161,7 +3161,11 @@ Error String::parse_utf8(const char *p_utf8, int p_len, bool p_skip_cr) {
 		int skip = 0;
 		uint8_t c_start = 0;
 		while (ptrtmp != ptrtmp_limit && *ptrtmp) {
+#if CHAR_MIN == 0
+			uint8_t c = *ptrtmp;
+#else
 			uint8_t c = *ptrtmp >= 0 ? *ptrtmp : uint8_t(256 + *ptrtmp);
+#endif
 
 			if (skip == 0) {
 				if (p_skip_cr && c == '\r') {
diff --git a/drivers/gles2/rasterizer_storage_gles2.h b/drivers/gles2/rasterizer_storage_gles2.h
index 534bef940..dc47cb988 100644
--- a/drivers/gles2/rasterizer_storage_gles2.h
+++ b/drivers/gles2/rasterizer_storage_gles2.h
@@ -1087,10 +1087,10 @@ public:
 
 		struct MipMaps {
 			struct Size {
-				GLuint fbo;
-				GLuint color;
-				int width;
-				int height;
+				GLuint fbo = 0;
+				GLuint color = 0;
+				int width = 0;
+				int height = 0;
 			};
 
 			Vector<Size> sizes;
diff --git a/modules/csg/csg.h b/modules/csg/csg.h
index 6106c11df..c06180077 100644
--- a/modules/csg/csg.h
+++ b/modules/csg/csg.h
@@ -162,7 +162,7 @@ struct CSGBrushOperation {
 		};
 
 		struct Face2D {
-			int vertex_idx[3];
+			int vertex_idx[3] = {};
 		};
 
 		Vector<Vertex2D> vertices;
@@ -170,7 +170,7 @@ struct CSGBrushOperation {
 		Plane plane;
 		Transform to_2D;
 		Transform to_3D;
-		float vertex_snap2;
+		float vertex_snap2 = 0.0;
 
 		inline int _get_point_idx(const Vector2 &p_point);
 		inline int _add_vertex(const Vertex2D &p_vertex);
diff --git a/servers/physics/space_sw.cpp b/servers/physics/space_sw.cpp
index bfc81ec1f..bf449c20b 100644
--- a/servers/physics/space_sw.cpp
+++ b/servers/physics/space_sw.cpp
@@ -116,8 +116,8 @@ bool PhysicsDirectSpaceStateSW::intersect_ray(const Vector3 &p_from, const Vecto
 
 	bool collided = false;
 	Vector3 res_point, res_normal;
-	int res_shape;
-	const CollisionObjectSW *res_obj;
+	int res_shape = 0;
+	const CollisionObjectSW *res_obj = nullptr;
 	real_t min_d = 1e10;
 
 	for (int i = 0; i < amount; i++) {
diff --git a/servers/physics_2d/space_2d_sw.cpp b/servers/physics_2d/space_2d_sw.cpp
index 607d463b0..d4b7afc1e 100644
--- a/servers/physics_2d/space_2d_sw.cpp
+++ b/servers/physics_2d/space_2d_sw.cpp
@@ -138,8 +138,8 @@ bool Physics2DDirectSpaceStateSW::intersect_ray(const Vector2 &p_from, const Vec
 
 	bool collided = false;
 	Vector2 res_point, res_normal;
-	int res_shape;
-	const CollisionObject2DSW *res_obj;
+	int res_shape = 0;
+	const CollisionObject2DSW *res_obj = nullptr;
 	real_t min_d = 1e10;
 
 	for (int i = 0; i < amount; i++) {