diff --git a/colorspace-fix-assertion.patch b/colorspace-fix-assertion.patch
new file mode 100644
index 0000000..6364aaf
--- /dev/null
+++ b/colorspace-fix-assertion.patch
@@ -0,0 +1,34 @@
+From fbd1ecebde3e336ad4f205381867adddfd4f754b Mon Sep 17 00:00:00 2001
+From: sekrit-twc <noreply@example.com>
+Date: Sat, 8 Feb 2020 12:46:02 -0800
+Subject: [PATCH] colorspace: fix assertion
+
+---
+ src/zimg/colorspace/operation_impl.cpp | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/src/zimg/colorspace/operation_impl.cpp b/src/zimg/colorspace/operation_impl.cpp
+index f8bad30..ccd16b1 100644
+--- a/src/zimg/colorspace/operation_impl.cpp
++++ b/src/zimg/colorspace/operation_impl.cpp
+@@ -343,7 +343,7 @@ std::unique_ptr<Operation> create_inverse_arib_b67_operation(const Matrix3x3 &m,
+ std::unique_ptr<Operation> create_cl_yuv_to_rgb_operation(const ColorspaceDefinition &in, const ColorspaceDefinition &out, const OperationParams &params, CPUClass cpu)
+ {
+ 	zassert_d(in.primaries == out.primaries, "primaries mismatch");
+-	zassert_d(in.matrix == MatrixCoefficients::REC_2020_CL && in.transfer == TransferCharacteristics::REC_709, "must be 2020 CL");
++	zassert_d((in.matrix == MatrixCoefficients::REC_2020_CL || in.matrix == MatrixCoefficients::CHROMATICITY_DERIVED_CL) && in.transfer == TransferCharacteristics::REC_709, "must be 2020 CL");
+ 	zassert_d(out.matrix == MatrixCoefficients::RGB && out.transfer == TransferCharacteristics::LINEAR, "must be linear RGB");
+ 
+ 	// CL is always scene-referred.
+@@ -356,7 +356,7 @@ std::unique_ptr<Operation> create_cl_rgb_to_yuv_operation(const ColorspaceDefini
+ {
+ 	zassert_d(in.primaries == out.primaries, "primaries mismatch");
+ 	zassert_d(in.matrix == MatrixCoefficients::RGB && in.transfer == TransferCharacteristics::LINEAR, "must be linear RGB");
+-	zassert_d(out.matrix == MatrixCoefficients::REC_2020_CL && out.transfer == TransferCharacteristics::REC_709, "must be 2020 CL");
++	zassert_d((out.matrix == MatrixCoefficients::REC_2020_CL || out.matrix == MatrixCoefficients::CHROMATICITY_DERIVED_CL) && out.transfer == TransferCharacteristics::REC_709, "must be 2020 CL");
+ 
+ 	// CL is always scene-referred.
+ 	TransferFunction func = select_transfer_function(out.transfer, params.peak_luminance, true);
+-- 
+2.25.1
+
diff --git a/zimg.changes b/zimg.changes
index 43309e1..be211c3 100644
--- a/zimg.changes
+++ b/zimg.changes
@@ -1,3 +1,9 @@
+-------------------------------------------------------------------
+Tue Mar 17 07:58:45 UTC 2020 - Martin Liška <mliska@suse.cz>
+
+- Add colorspace-fix-assertion.patch in order to fix
+  build with GCC10. See gh#sekrit-twc/zimg#122.
+
 -------------------------------------------------------------------
 Mon Mar  2 12:32:52 UTC 2020 - Martin Herkt <9+suse@cirno.systems>
 
diff --git a/zimg.spec b/zimg.spec
index ea164f6..939ee5a 100644
--- a/zimg.spec
+++ b/zimg.spec
@@ -27,6 +27,7 @@ URL:            https://github.com/sekrit-twc/zimg
 Source0:        zimg-%{version}.tar.xz
 Source99:       baselibs.conf
 Patch0:         update-matrix3.cpp.patch
+PAtch1:         colorspace-fix-assertion.patch
 BuildRequires:  autoconf
 BuildRequires:  automake
 BuildRequires:  gcc-c++
@@ -57,6 +58,7 @@ developing applications that use libzimg%{sover}.
 %prep
 %setup -q
 %patch0 -p1
+%patch1 -p1
 
 %build
 autoreconf -fiv