diff --git a/gambas3.spec b/gambas3.spec
index 51b968e..cce885c 100644
--- a/gambas3.spec
+++ b/gambas3.spec
@@ -1,6 +1,9 @@
 # test
 %global enablejit 1
 
+# Needed to link against poppler
+%global build_cxxflags %{build_cxxflags} -std=c++17
+
 # This component depends on ancient and super-abandoned things.
 # But they're alive again, sortof...
 %global gtkopengl 1