diff --git a/srcpkgs/giac/patches/fix-sum.patch b/srcpkgs/giac/patches/fix-sum.patch
new file mode 100644
index 00000000000000..7546f716cffec9
--- /dev/null
+++ b/srcpkgs/giac/patches/fix-sum.patch
@@ -0,0 +1,11 @@
+--- a/src/usual.cc	2024-06-12 04:52:40.000000000 -0300
++++ b/src/usual.cc	2024-07-14 19:06:25.382736933 -0300
+@@ -6672,7 +6672,7 @@
+ 
+   // symbolic symb_iquo(const gen & a,const gen & b){ return symbolic(at_iquo,makevecteur(a,b));  }
+   bool is_integral(gen & indice){
+-    if (indice.is_symb_of_sommet(at_neg))
++    if (indice.is_symb_of_sommet(at_neg) && !is_inf(indice))
+       indice=-indice._SYMBptr->feuille;
+     if (is_cinteger(indice))
+       return true;
diff --git a/srcpkgs/giac/template b/srcpkgs/giac/template
index 447b376fc67460..2eb78bb85d6179 100644
--- a/srcpkgs/giac/template
+++ b/srcpkgs/giac/template
@@ -1,6 +1,6 @@
 # Template file for 'giac'
 pkgname=giac
-version=1.9.0.97
+version=1.9.0.994
 revision=1
 build_style=gnu-configure
 configure_args="--disable-micropy --disable-quickjs"
@@ -15,7 +15,7 @@ license="GPL-3.0-or-later"
 homepage="https://www-fourier.ujf-grenoble.fr/~parisse/giac.html"
 changelog="https://www-fourier.ujf-grenoble.fr/~parisse/install_en#new"
 distfiles="https://www-fourier.ujf-grenoble.fr/~parisse/debian/dists/stable/main/source/giac_${version%.*}-${version##*.}.tar.gz"
-checksum=fb384d92a5dc54d47df930b010de13c91e0d827a684b70f9673ae6b08be5f48d
+checksum=44430a2173c409d8df37872e8a94e0926d9be9134fb3faf11d543fbb37b33214
 
 # need more than 4*65536 stack, see try_parse() in gen.cc line 11812
 LDFLAGS="-Wl,-z,stack-size=2097152"
@@ -38,6 +38,9 @@ esac
 post_extract() {
 	# Missing... triggers doc rebuild which fails
 	touch doc/en/tutoriel.stamp
+	# remove a binary that works only for a particular host
+	# the binary will be rebuilt using host compiler
+	rm src/mkjs
 }
 
 pre_configure() {