diff --git a/src/DrawingCallback.h b/src/DrawingCallback.h
index 1ebd1728..825b1b8c 100644
--- a/src/DrawingCallback.h
+++ b/src/DrawingCallback.h
@@ -23,8 +23,7 @@
  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  *
  */
-#ifndef DRAWINGCALLBACK_H
-#define	DRAWINGCALLBACK_H
+#pragma once
 
 #include <vector>
 #include <math.h>
@@ -62,6 +61,3 @@ private:
 	return pow(1.0 - t, exp);
     }
 };
-
-#endif	/* DRAWINGCALLBACK_H */
-
diff --git a/src/FontCache.h b/src/FontCache.h
index 1fc7b414..58d79f09 100644
--- a/src/FontCache.h
+++ b/src/FontCache.h
@@ -23,8 +23,7 @@
  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  *
  */
-#ifndef FONTCACHE_H
-#define	FONTCACHE_H
+#pragma once
 
 #include <map>
 #include <string>
@@ -96,5 +95,3 @@ private:
     FT_Face find_face_in_path(std::string path, std::string font);
 };
 
-#endif	/* FONTCACHE_H */
-
diff --git a/src/FontListDialog.h b/src/FontListDialog.h
index b1cbaa97..34a4042a 100644
--- a/src/FontListDialog.h
+++ b/src/FontListDialog.h
@@ -1,5 +1,4 @@
-#ifndef FONTLISTDIALOG_H_
-#define FONTLISTDIALOG_H_
+#pragma once
 
 #include <QStandardItemModel>
 
@@ -19,5 +18,3 @@ public:
 private:
         QStandardItemModel *model;
 };
-
-#endif
diff --git a/src/FreetypeRenderer.h b/src/FreetypeRenderer.h
index 1332d9cf..4b07731d 100644
--- a/src/FreetypeRenderer.h
+++ b/src/FreetypeRenderer.h
@@ -23,8 +23,7 @@
  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  *
  */
-#ifndef FREETYPERENDERER_H
-#define	FREETYPERENDERER_H
+#pragma once
 
 #include <string>
 #include <vector>
@@ -136,6 +135,3 @@ private:
     static int outline_conic_to_func(const FT_Vector *c1, const FT_Vector *to, void *user);
     static int outline_cubic_to_func(const FT_Vector *c1, const FT_Vector *c2, const FT_Vector *to, void *user);
 };
-
-#endif	/* FREETYPERENDERER_H */
-
diff --git a/src/Geometry.h b/src/Geometry.h
index 042a0658..ffe7bf22 100644
--- a/src/Geometry.h
+++ b/src/Geometry.h
@@ -1,5 +1,4 @@
-#ifndef GEOMETRY_H_
-#define GEOMETRY_H_
+#pragma once
 
 #include <stddef.h>
 #include <string>
@@ -29,5 +28,3 @@ public:
 protected:
 	int convexity;
 };
-
-#endif
diff --git a/src/GeometryCache.h b/src/GeometryCache.h
index 7dfaad73..5dd380ea 100644
--- a/src/GeometryCache.h
+++ b/src/GeometryCache.h
@@ -1,5 +1,4 @@
-#ifndef GEOMETRYCACHE_H_
-#define GEOMETRYCACHE_H_
+#pragma once
 
 #include "cache.h"
 #include "memory.h"
@@ -32,5 +31,3 @@ private:
 
 	Cache<std::string, cache_entry> cache;
 };
-
-#endif
diff --git a/src/Polygon2d.h b/src/Polygon2d.h
index 294a0e86..cf28e74d 100644
--- a/src/Polygon2d.h
+++ b/src/Polygon2d.h
@@ -1,5 +1,4 @@
-#ifndef POLYGON2D_H_
-#define POLYGON2D_H_
+#pragma once
 
 #include "Geometry.h"
 #include "linalg.h"
@@ -36,5 +35,3 @@ private:
 	Outlines2d theoutlines;
 	bool sanitized;
 };
-
-#endif
diff --git a/src/clipper-utils.h b/src/clipper-utils.h
index c36c6531..02bbfea1 100644
--- a/src/clipper-utils.h
+++ b/src/clipper-utils.h
@@ -1,5 +1,4 @@
-#ifndef CLIPPER_UTILS_H_
-#define CLIPPER_UTILS_H_
+#pragma once
 
 #include "polyclipping/clipper.hpp"
 #include "Polygon2d.h"
@@ -20,5 +19,3 @@ namespace ClipperUtils {
 	Polygon2d *apply(const std::vector<const Polygon2d*> &polygons, ClipperLib::ClipType);
 	Polygon2d *apply(const std::vector<ClipperLib::Paths> &pathsvector, ClipperLib::ClipType);
 };
-
-#endif
diff --git a/src/offsetnode.h b/src/offsetnode.h
index 66bc52de..be651903 100644
--- a/src/offsetnode.h
+++ b/src/offsetnode.h
@@ -1,5 +1,4 @@
-#ifndef OFFSETNODE_H_
-#define OFFSETNODE_H_
+#pragma once
 
 #include "node.h"
 #include "visitor.h"
@@ -19,5 +18,3 @@ public:
 	double fn, fs, fa, delta, miter_limit;
         ClipperLib::JoinType join_type;
 };
-
-#endif
diff --git a/src/polyset-utils.h b/src/polyset-utils.h
index 5d284f65..2bdaca03 100644
--- a/src/polyset-utils.h
+++ b/src/polyset-utils.h
@@ -1,5 +1,4 @@
-#ifndef POLYSET_UTILS_H_
-#define POLYSET_UTILS_H_
+#pragma once
 
 class Polygon2d;
 class PolySet;
@@ -10,5 +9,3 @@ namespace PolysetUtils {
 	void tessellate_faces(const PolySet &inps, PolySet &outps);
 
 };
-
-#endif
diff --git a/src/textnode.h b/src/textnode.h
index c4c77a16..1cebd655 100644
--- a/src/textnode.h
+++ b/src/textnode.h
@@ -1,5 +1,4 @@
-#ifndef TEXTNODE_H_
-#define TEXTNODE_H_
+#pragma once
 
 #include "node.h"
 #include "visitor.h"
@@ -28,5 +27,3 @@ private:
 	FreetypeRenderer::Params params;
 	friend TextModule;
 };
-
-#endif