diff --git a/src/gen-harfbuzzcc.py b/src/gen-harfbuzzcc.py
index b25bcc7..97bf2ab 100644
--- a/src/gen-harfbuzzcc.py
+++ b/src/gen-harfbuzzcc.py
@@ -15,4 +15,8 @@ with open (OUTPUT, "wb") as f:
        f.write ("".join ('#include "{}"\n'.format (os.path.basename (x)) for x in sources if x.endswith (".cc")).encode ())
 
 # copy it also to src/
-shutil.copyfile (OUTPUT, os.path.join (CURRENT_SOURCE_DIR, os.path.basename (OUTPUT)))
+src = OUTPUT
+dst = os.path.join (CURRENT_SOURCE_DIR, os.path.basename (OUTPUT))
+# Avoid SameFileError
+if not os.path.samefile(src, dst):
+    shutil.copyfile (src, dst)
diff --git a/src/gen-hb-version.py b/src/gen-hb-version.py
index 5ec2024..59d4754 100644
--- a/src/gen-hb-version.py
+++ b/src/gen-hb-version.py
@@ -33,4 +33,8 @@ with open (INPUT, "r", encoding='utf-8') as template:
                        .encode ())
 
 # copy it also to src/
-shutil.copyfile (OUTPUT, os.path.join (CURRENT_SOURCE_DIR, os.path.basename (OUTPUT)))
+src = OUTPUT
+dst = os.path.join(CURRENT_SOURCE_DIR, os.path.basename (OUTPUT))
+# Avoid SameFileError if src and dst is the same
+if not os.path.samefile(src, dst):
+    shutil.copyfile (src, dst)
diff --git a/src/gen-ragel-artifacts.py b/src/gen-ragel-artifacts.py
index b60ec3b..288e224 100644
--- a/src/gen-ragel-artifacts.py
+++ b/src/gen-ragel-artifacts.py
@@ -22,4 +22,8 @@ hh = rl.replace ('.rl', '.hh')
 subprocess.Popen ([ragel, '-e', '-F1', '-o', hh, rl], cwd=outdir).wait ()
 
 # copy it also to src/
-shutil.copyfile (os.path.join (outdir, hh), os.path.join (CURRENT_SOURCE_DIR, hh))
+src = os.path.join (outdir, hh)
+dst = os.path.join (CURRENT_SOURCE_DIR, hh)
+# Avoid SameFileError
+if not os.path.samefile(src, dst):
+    shutil.copyfile (src, dst)