diff --git a/Makefile.pre.in b/Makefile.pre.in
index 02ce0af55ce..f16eb96418e 100644
--- a/Makefile.pre.in
+++ b/Makefile.pre.in
@@ -69,8 +69,7 @@ INSTALL_SCRIPT= @INSTALL_SCRIPT@
 INSTALL_DATA=	@INSTALL_DATA@
 # Shared libraries must be installed with executable mode on some systems;
 # rather than figuring out exactly which, we always give them executable mode.
-# Also, making them read-only seems to be a good idea...
-INSTALL_SHARED= ${INSTALL} -m 555
+INSTALL_SHARED= ${INSTALL} -m 755
 
 MKDIR_P=	@MKDIR_P@
 
diff --git a/Misc/NEWS.d/next/Build/2018-07-27-09-52-48.bpo-34245.bBV0NI.rst b/Misc/NEWS.d/next/Build/2018-07-27-09-52-48.bpo-34245.bBV0NI.rst
new file mode 100644
index 00000000000..3822bb0e4f0
--- /dev/null
+++ b/Misc/NEWS.d/next/Build/2018-07-27-09-52-48.bpo-34245.bBV0NI.rst
@@ -0,0 +1,2 @@
+The Python shared library is now installed with write permission (mode 0755),
+which is the standard way of installing such libraries.