diff --git a/srcpkgs/iverilog/template b/srcpkgs/iverilog/template
index 44f1c8e0ae8..c10b6ab8630 100644
--- a/srcpkgs/iverilog/template
+++ b/srcpkgs/iverilog/template
@@ -15,7 +15,8 @@ checksum=4b884261645a73b37467242d6ae69264fdde2e7c4c15b245d902531efaaeb234
 
 nocross="draw_tt.exe: cannot execute binary file: Exec format error"
 
-CXXFLAGS='-Wimplicit-fallthrough=0'
+CFLAGS='-fcommon'
+CXXFLAGS='-fcommon -Wimplicit-fallthrough=0'
 
 pre_configure() {
 	sh ./autoconf.sh