diff --git a/gnu/packages/maths.scm b/gnu/packages/maths.scm
index ea374a4f4c..b025ace4bb 100644
--- a/gnu/packages/maths.scm
+++ b/gnu/packages/maths.scm
@@ -3488,7 +3488,7 @@ (define-public mumps
 LIBOTHERS    = -pthread
 CDEFS        = -DAdd_
 PIC          = -fPIC
-OPTF         = -O2 -DALLOW_NON_INIT $(PIC)
+OPTF         = -O2 -DALLOW_NON_INIT -fallow-argument-mismatch $(PIC)
 OPTL         = -O2 $(PIC)
 OPTC         = -O2 $(PIC)
 INCS         = $(INCSEQ)