diff --git a/srcpkgs/spectrum3d/template b/srcpkgs/spectrum3d/template
index 1c9f069248..3d5c048319 100644
--- a/srcpkgs/spectrum3d/template
+++ b/srcpkgs/spectrum3d/template
@@ -11,3 +11,5 @@ license="GPL-3.0-or-later"
 homepage="https://spectrum3d.sourceforge.net"
 distfiles="${SOURCEFORGE_SITE}/project/spectrum3d/spectrum3d-${version}.tar.gz"
 checksum=274ec3cb16070e2441d3d202fce946c4c4c22c9ac6275d950ad989ed5111e4cb
+
+CFLAGS="-fcommon"