diff --git a/packages/vasp/intel/default.nix b/packages/vasp/intel/default.nix
index a9e7603d..ef9ff23c 100644
--- a/packages/vasp/intel/default.nix
+++ b/packages/vasp/intel/default.nix
@@ -37,6 +37,9 @@ let vasp = stdenv.mkDerivation
 
     # tell openmpi use ifx
     OMPI_F90 = "ifx";
+
+    dontStrip = true;
+    dontPatchELF = true;
   };
 in writeShellScriptBin "vasp-intel"
 ''
diff --git a/packages/vasp/intel/makefile.include b/packages/vasp/intel/makefile.include
index 8abc7548..065aac6f 100644
--- a/packages/vasp/intel/makefile.include
+++ b/packages/vasp/intel/makefile.include
@@ -19,7 +19,8 @@ FREE        = -free -names lowercase
 
 FFLAGS      = -assume byterecl -w
 
-OFLAG       = -O2
+# OFLAG       = -O2
+OFLAG       = -g
 OFLAG_IN    = $(OFLAG)
 DEBUG       = -O0
 
diff --git a/packages/vasp/nvidia/default.nix b/packages/vasp/nvidia/default.nix
index 6bca88e0..df0e5650 100644
--- a/packages/vasp/nvidia/default.nix
+++ b/packages/vasp/nvidia/default.nix
@@ -35,6 +35,8 @@ let vasp = stdenv.mkDerivation
     MKLROOT = mkl;
     QD = "${stdenv.cc.cc}/Linux_x86_64/${stdenv.cc.cc.version}/compilers/extras/qd";
   };
+  dontStrip = true;
+  dontPatchELF = true;
 };
 in writeShellScriptBin "vasp-nvidia"
 ''
diff --git a/packages/vasp/nvidia/makefile.include b/packages/vasp/nvidia/makefile.include
index d3a8c64e..6db4614a 100644
--- a/packages/vasp/nvidia/makefile.include
+++ b/packages/vasp/nvidia/makefile.include
@@ -24,7 +24,8 @@ FREE        = -Mfree
 
 FFLAGS      = -Mbackslash -Mlarge_arrays
 
-OFLAG       = -fast
+# OFLAG       = -fast
+OFLAG       = -g
 
 DEBUG       = -Mfree -O0 -traceback