diff --git a/src/path/splinefit/bezier-fit.cpp b/src/path/splinefit/bezier-fit.cpp
index 111f538590f7183cf881f5bd993afac3514661fc..ed506da79da94d0f6641bd2186fe432070eb65d5 100644
--- a/src/path/splinefit/bezier-fit.cpp
+++ b/src/path/splinefit/bezier-fit.cpp
@@ -6,10 +6,8 @@
 #include <2geom/bezier-utils.h>
 #include <2geom/point.h>
 
-extern "C" {
-    #include "splinefit.h"
-    #include "splinefont.h"
-}
+#include "splinefit.h"
+#include "splinefont.h"
 
 int bezier_fit(Geom::Point bezier[4], const std::vector<InputPoint>& data) {
 
diff --git a/src/path/splinefit/splinefit.h b/src/path/splinefit/splinefit.h
index 22e21fcdbea6f18854689844c4cde1a837deaf8d..89f830e54879fc2e9aeb92a341890756e50b6ed3 100644
--- a/src/path/splinefit/splinefit.h
+++ b/src/path/splinefit/splinefit.h
@@ -32,6 +32,8 @@
 // #include <fontforge-config.h>
 #include "splinefont.h"
 
+G_BEGIN_DECLS
+
 typedef struct fitpoint {
     BasePoint p;
     BasePoint ut;
@@ -75,4 +77,7 @@ extern SplinePoint *ApproximateSplineSetFromGen(SplinePoint *from, SplinePoint *
                                                 bigreal toler, int toler_is_sumsq,
                                                 GenPointsP genp, void *tok, int order2);
 
+
+G_END_DECLS
+
 #endif /* FONTFORGE_SPLINEFIT_H */
diff --git a/src/path/splinefit/splinefont.h b/src/path/splinefit/splinefont.h
index 83db934cec41f3d69d79b249e440ef81c25d6381..f8aaaa82b7b988b50feb8b30141f50987e031f37 100644
--- a/src/path/splinefit/splinefont.h
+++ b/src/path/splinefit/splinefont.h
@@ -5,6 +5,8 @@
 
 #include <glib.h>
 
+G_BEGIN_DECLS
+
 typedef double real;
 typedef double bigreal;
 typedef double extended;
@@ -188,4 +190,6 @@ enum pconvert_flags {
 
 void SplinesRemoveBetween(SplinePoint *from, SplinePoint *to, int type);
 
+G_END_DECLS
+
 #endif // _SEEN_SPLINEFONT_H_