diff --git a/pkgs/applications/science/math/calculix/calculix.patch b/pkgs/applications/science/math/calculix/calculix.patch
index 2334d54711e5..36048546948c 100644
--- a/pkgs/applications/science/math/calculix/calculix.patch
+++ b/pkgs/applications/science/math/calculix/calculix.patch
@@ -1,7 +1,8 @@
-diff -Naur a/ccx_2.17/src/Makefile b/ccx_2.17/src/Makefile
---- a/ccx_2.17/src/Makefile	2020-07-23 21:41:38.507761972 +0200
-+++ b/ccx_2.17/src/Makefile	2020-08-22 16:53:50.004938281 +0200
-@@ -18,15 +18,10 @@
+diff --git a/ccx_2.19/src/Makefile b/ccx_2.19/src/Makefile
+index c503513..8a69a0c 100755
+--- a/ccx_2.19/src/Makefile
++++ b/ccx_2.19/src/Makefile
+@@ -18,15 +18,10 @@ OCCXF = $(SCCXF:.f=.o)
  OCCXC = $(SCCXC:.c=.o)
  OCCXMAIN = $(SCCXMAIN:.c=.o)
  
@@ -13,10 +14,10 @@ diff -Naur a/ccx_2.17/src/Makefile b/ccx_2.17/src/Makefile
 -	../../../ARPACK/libarpack_INTEL.a \
 -       -lpthread -lm -lc
 -
--ccx_2.17: $(OCCXMAIN) ccx_2.17.a  $(LIBS)
--	./date.pl; $(CC) $(CFLAGS) -c ccx_2.17.c; $(FC)  -Wall -O2 -o $@ $(OCCXMAIN) ccx_2.17.a $(LIBS)
-+ccx_2.17: $(OCCXMAIN) ccx_2.17.a
-+	$(CC) $(CFLAGS) -c ccx_2.17.c; $(FC)  -Wall -O2 -o $@ $(OCCXMAIN) ccx_2.17.a $(LIBS)
+-ccx_2.19: $(OCCXMAIN) ccx_2.19.a  $(LIBS)
+-	./date.pl; $(CC) $(CFLAGS) -c ccx_2.19.c; $(FC)  -Wall -O2 -o $@ $(OCCXMAIN) ccx_2.19.a $(LIBS) -fopenmp
++ccx_2.19: $(OCCXMAIN) ccx_2.19.a
++	$(CC) $(CFLAGS) -c ccx_2.19.c; $(FC)  -Wall -O2 -o $@ $(OCCXMAIN) ccx_2.19.a $(LIBS) -fopenmp
  
- ccx_2.17.a: $(OCCXF) $(OCCXC)
+ ccx_2.19.a: $(OCCXF) $(OCCXC)
  	ar vr $@ $?
diff --git a/pkgs/applications/science/math/calculix/default.nix b/pkgs/applications/science/math/calculix/default.nix
index 44721c560b89..df943277a627 100644
--- a/pkgs/applications/science/math/calculix/default.nix
+++ b/pkgs/applications/science/math/calculix/default.nix
@@ -2,11 +2,11 @@
 
 stdenv.mkDerivation rec {
   pname = "calculix";
-  version = "2.17";
+  version = "2.19";
 
   src = fetchurl {
     url = "http://www.dhondt.de/ccx_${version}.src.tar.bz2";
-    sha256 = "0l3fizxfdj2mpdp62wnk9v47q2yc3cy39fpsm629z7bjmba8lw6a";
+    sha256 = "01vdy9sns58hkm39z6d0r5y7gzqf5z493d18jin9krqib1l6jnn7";
   };
 
   nativeBuildInputs = [ gfortran ];