diff --git a/krfb.changes b/krfb.changes
index 4389a47..6c5ceda 100644
--- a/krfb.changes
+++ b/krfb.changes
@@ -7,6 +7,7 @@ Thu Jul 26 13:00:54 UTC 2018 - lbeltrame@kde.org
   * https://www.kde.org/announcements/announce-applications-18.07.80.php
 - Changes since 18.04.3:
   * Fix IPv6 connectivity
+- Build with gcc7 on Leap 42.3
 
 -------------------------------------------------------------------
 Fri Jul 13 04:50:09 UTC 2018 - lbeltrame@kde.org
diff --git a/krfb.spec b/krfb.spec
index 7f937fd..d721869 100644
--- a/krfb.spec
+++ b/krfb.spec
@@ -54,6 +54,15 @@ BuildRequires:  pkgconfig(Qt5X11Extras)
 BuildRequires:  pkgconfig(xdamage)
 BuildRequires:  pkgconfig(xt)
 BuildRequires:  pkgconfig(xtst)
+# Needed for 42.3
+%if 0%{?suse_version} < 1330
+# It does not build with the default compiler (GCC 4.8) on Leap 42.x
+%if 0%{?sle_version} < 120300
+BuildRequires:  gcc6-c++
+%else
+BuildRequires:  gcc7-c++
+%endif
+%endif
 %if %{with lang}
 Recommends:     %{name}-lang
 %endif
@@ -70,6 +79,16 @@ VNC-compatible server to share KDE desktops.
 %setup -q
 
 %build
+%if 0%{?suse_version} < 1330
+  # It does not build with the default compiler (GCC 4.8) on Leap 42.x
+  %if 0%{?sle_version} < 120300
+    export CC=gcc-6
+    export CXX=g++-6
+  %else
+    export CC=gcc-7
+    export CXX=g++-7
+  %endif
+%endif
 %ifarch ppc ppc64
 export RPM_OPT_FLAGS="%{optflags} -mminimal-toc"
 %endif