diff --git a/src/sage/config.py.in b/src/sage/config.py.in
index 3a95538d313..cdd551122fc 100644
--- a/src/sage/config.py.in
+++ b/src/sage/config.py.in
@@ -4,6 +4,8 @@ import sage
 
 VERSION = "@PACKAGE_VERSION@"
 
+SAGE_BUILD_SRC = "@EDITABLE_SRC@/src"
+
 # The following must not be used during build to determine source or installation
 # location of sagelib.  See comments in SAGE_ROOT/src/Makefile.in
 # These variables come first so that other substituted variable values can refer
diff --git a/src/sage/misc/sageinspect.py b/src/sage/misc/sageinspect.py
index c237af52c24..7a8e8291406 100644
--- a/src/sage/misc/sageinspect.py
+++ b/src/sage/misc/sageinspect.py
@@ -270,6 +270,14 @@ def _extract_embedded_position(docstring):
         return None
 
     raw_filename = res.group('FILENAME')
+
+    # remove SAGE_BUILD_SRC prefix to workaround
+    # https://github.com/cython/cython/pull/6755
+    from sage.config import SAGE_BUILD_SRC
+    from os.path import commonprefix, relpath
+    if commonprefix([raw_filename, SAGE_BUILD_SRC]) == SAGE_BUILD_SRC:
+        raw_filename = relpath(raw_filename, SAGE_BUILD_SRC)
+
     filename = raw_filename
 
     if not os.path.isabs(filename):