diff --git a/vigra-1.11.1.py37.patch b/vigra-1.11.1.py37.patch
new file mode 100644
index 0000000..a1be659
--- /dev/null
+++ b/vigra-1.11.1.py37.patch
@@ -0,0 +1,12 @@
+diff -ur vigra-1.11.1/vigranumpy/src/core/vigranumpycore.cxx vigra-1.11.1.new/vigranumpy/src/core/vigranumpycore.cxx
+--- vigra-1.11.1/vigranumpy/src/core/vigranumpycore.cxx	2017-05-19 16:01:08.000000000 +0100
++++ vigra-1.11.1.new/vigranumpy/src/core/vigranumpycore.cxx	2018-08-23 00:08:42.980416247 +0100
+@@ -61,7 +61,7 @@
+ 	return checksum(data, size);
+ #else
+ 	Py_ssize_t size = 0;
+-	char * data = PyUnicode_AsUTF8AndSize(s.ptr(), &size);
++	const char * data = PyUnicode_AsUTF8AndSize(s.ptr(), &size);
+ 	return checksum(data, size);
+ #endif
+ }
diff --git a/vigra.spec b/vigra.spec
index 63e2d0c..acc5ea4 100644
--- a/vigra.spec
+++ b/vigra.spec
@@ -10,7 +10,7 @@
 Summary:        Generic Programming for Computer Vision
 Name:           vigra
 Version:        1.11.1
-Release:        9%{?dist}
+Release:        10%{?dist}
 License:        MIT
 Group:          Development/Libraries
 # The "Lenna" files are non-free, we need to remove them from the source tarball.
@@ -26,6 +26,8 @@ Patch0:         https://github.com/ukoethe/vigra/commit/81958d302494e137f98a8b1d
 # Avoid attempt to install non-free 'lenna' files
 Patch1:         vigra-1.10.0-no-lenna.patch
 Patch2:         vigra-1.11.1.docdir.patch
+# https://bugzilla.redhat.com/show_bug.cgi?id=1597394
+Patch3:         vigra-1.11.1.py37.patch
 URL:            http://ukoethe.github.io/vigra/
 BuildRequires:  gcc-c++ zlib-devel libjpeg-devel libpng-devel libtiff-devel fftw-devel >= 3
 BuildRequires:  cmake boost-devel doxygen
@@ -174,6 +176,9 @@ install -p -m755 -D %{SOURCE1} $RPM_BUILD_ROOT%{_bindir}/vigra-config
 %endif
 
 %changelog
+* Wed Aug 22 2018 Bruno Postle <bruno@postle.net> - 1.11.1-10
+- Patched for python 3.7
+
 * Sat Jul 14 2018 Fedora Release Engineering <releng@fedoraproject.org> - 1.11.1-9
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_29_Mass_Rebuild