diff --git a/libraries/frei0r/frei0r.SlackBuild b/libraries/frei0r/frei0r.SlackBuild
index 51193323e5..ce64a47e50 100644
--- a/libraries/frei0r/frei0r.SlackBuild
+++ b/libraries/frei0r/frei0r.SlackBuild
@@ -96,7 +96,7 @@ mkdir -p build
 cd build
   cmake \
     -DCMAKE_C_FLAGS:STRING="$SLKCFLAGS" \
-    -DCMAKE_CXX_FLAGS:STRING="$SLKCFLAGS" \
+    -DCMAKE_CXX_FLAGS:STRING="$SLKCFLAGS -std=c++11" \
     -DCMAKE_INSTALL_PREFIX=/usr \
     -DCMAKE_INSTALL_LIBDIR=/usr/lib$LIBDIRSUFFIX \
     -DCMAKE_BUILD_TYPE=Release ..