diff --git a/melange/core/src/veriloga/osdi_0_4.rs b/melange/core/src/veriloga/osdi_0_4.rs
index 2e7a6143..382d448e 100644
--- a/melange/core/src/veriloga/osdi_0_4.rs
+++ b/melange/core/src/veriloga/osdi_0_4.rs
@@ -62,6 +62,7 @@ pub const DOMAIN_CONTINUOUS: u32 = 2;
 pub const NOISE_TYPE_WHITE: u32 = 0;
 pub const NOISE_TYPE_FLICKER: u32 = 1;
 pub const NOISE_TYPE_TABLE: u32 = 2;
+pub const MODULEFLAG_ABSTIME: u32 = 1;
 
 #[repr(C)]
 pub struct OsdiLimFunction {
@@ -195,6 +196,7 @@ pub struct OsdiDescriptor {
     pub residual_nature: *mut OsdiNatureRef,
     pub noise_source_type: *mut u32,
     pub load_noise_params: fn(*mut c_void, *mut c_void, *mut f64, *mut f64),
+    pub module_flags: u32,
 }
 impl OsdiDescriptor {
     pub fn access(
diff --git a/openvaf/openvaf/tests/load/osdi_0_4.rs b/openvaf/openvaf/tests/load/osdi_0_4.rs
index 2e7a6143..382d448e 100644
--- a/openvaf/openvaf/tests/load/osdi_0_4.rs
+++ b/openvaf/openvaf/tests/load/osdi_0_4.rs
@@ -62,6 +62,7 @@ pub const DOMAIN_CONTINUOUS: u32 = 2;
 pub const NOISE_TYPE_WHITE: u32 = 0;
 pub const NOISE_TYPE_FLICKER: u32 = 1;
 pub const NOISE_TYPE_TABLE: u32 = 2;
+pub const MODULEFLAG_ABSTIME: u32 = 1;
 
 #[repr(C)]
 pub struct OsdiLimFunction {
@@ -195,6 +196,7 @@ pub struct OsdiDescriptor {
     pub residual_nature: *mut OsdiNatureRef,
     pub noise_source_type: *mut u32,
     pub load_noise_params: fn(*mut c_void, *mut c_void, *mut f64, *mut f64),
+    pub module_flags: u32,
 }
 impl OsdiDescriptor {
     pub fn access(
diff --git a/openvaf/osdi/header/osdi_0_4.h b/openvaf/osdi/header/osdi_0_4.h
index b927f2a7..544c7a20 100644
--- a/openvaf/osdi/header/osdi_0_4.h
+++ b/openvaf/osdi/header/osdi_0_4.h
@@ -80,6 +80,8 @@
 #define NOISE_TYPE_FLICKER 1
 #define NOISE_TYPE_TABLE 2
 
+#define MODULEFLAG_ABSTIME 1
+
 typedef struct OsdiLimFunction {
   char *name;
   uint32_t num_args;
@@ -226,6 +228,7 @@ typedef struct OsdiDescriptor {
   OsdiNatureRef* residual_nature;
   uint32_t *noise_source_type;
   void (*load_noise_params)(void *inst, void *model, double *power, double *exponent);
+  uint32_t module_flags;
 }OsdiDescriptor;
 
 typedef struct OsdiNature {
diff --git a/openvaf/osdi/src/metadata.rs b/openvaf/osdi/src/metadata.rs
index c74067e7..2313c134 100644
--- a/openvaf/osdi/src/metadata.rs
+++ b/openvaf/osdi/src/metadata.rs
@@ -4,7 +4,7 @@ use std::iter::once;
 use hir::{CompilationDB, ParamSysFun, Type};
 use hir_def::db::HirDefDB;
 use hir_def::ndatable::NDATable;
-use hir_lower::CurrentKind;
+use hir_lower::{CurrentKind, ParamKind};
 use lasso::{Rodeo, Spur};
 use llvm_sys::core::{
     LLVMConstArray2, LLVMConstInt, LLVMConstPtrToInt, LLVMGetArrayLength2, LLVMGetDataLayoutStr,
@@ -34,7 +34,7 @@ use crate::metadata::osdi_0_4::{
     JACOBIAN_ENTRY_RESIST, JACOBIAN_ENTRY_RESIST_CONST, NATREF_DISCIPLINE_FLOW,
     NATREF_DISCIPLINE_POTENTIAL, NATREF_NONE, NOISE_TYPE_FLICKER, NOISE_TYPE_TABLE,
     NOISE_TYPE_WHITE, PARA_KIND_INST, PARA_KIND_MODEL, PARA_KIND_OPVAR, PARA_TY_INT, PARA_TY_REAL,
-    PARA_TY_STR,
+    PARA_TY_STR,MODULEFLAG_ABSTIME,
 };
 use crate::ty_len;
 
@@ -401,6 +401,14 @@ impl<'ll> OsdiCompilationUnit<'_, '_, 'll> {
                     .collect();
 
             let (uvec, rvec) = self.unknown_residual_natures(db);
+
+            let mut module_flags = 0u32;
+            module.intern.params.iter().for_each(|(p, _)| {
+                if let ParamKind::Abstime = p {
+                    module_flags |= MODULEFLAG_ABSTIME;
+                }            
+            });
+
             OsdiDescriptor {
                 name: module.info.module.name(db),
                 num_nodes: module.dae_system.unknowns.len() as u32,
@@ -457,6 +465,7 @@ impl<'ll> OsdiCompilationUnit<'_, '_, 'll> {
                 residual_nature: rvec,
                 noise_source_type,
                 load_noise_params: self.load_noise_params(),
+                module_flags: module_flags,
             }
         }
     }
diff --git a/openvaf/osdi/src/metadata/osdi_0_4.rs b/openvaf/osdi/src/metadata/osdi_0_4.rs
index 2b813b67..8b2d5b50 100644
--- a/openvaf/osdi/src/metadata/osdi_0_4.rs
+++ b/openvaf/osdi/src/metadata/osdi_0_4.rs
@@ -91,6 +91,7 @@ pub const DOMAIN_CONTINUOUS: u32 = 2;
 pub const NOISE_TYPE_WHITE: u32 = 0;
 pub const NOISE_TYPE_FLICKER: u32 = 1;
 pub const NOISE_TYPE_TABLE: u32 = 2;
+pub const MODULEFLAG_ABSTIME: u32 = 1;
 
 pub struct OsdiLimFunction<'ll> {
     pub name: String,
@@ -415,6 +416,7 @@ pub struct OsdiDescriptor<'ll> {
     pub residual_nature: Vec<OsdiNatureRef>,
     pub noise_source_type: Vec<u32>,
     pub load_noise_params: &'ll llvm_sys::LLVMValue,
+    pub module_flags: u32,
 }
 impl<'ll> OsdiDescriptor<'ll> {
     pub fn to_ll_val(
@@ -483,6 +485,7 @@ impl<'ll> OsdiDescriptor<'ll> {
             ctx.const_arr_ptr(tys.osdi_nature_ref, &arr_47),
             ctx.const_arr_ptr(ctx.ty_int(), &arr_48),
             self.load_noise_params,
+            ctx.const_unsigned_int(self.module_flags),
         ];
         let ty = tys.osdi_descriptor;
         ctx.const_struct(ty, &fields)
@@ -542,6 +545,7 @@ impl OsdiTyBuilder<'_, '_, '_> {
             ctx.ty_ptr(),
             ctx.ty_ptr(),
             ctx.ty_ptr(),
+            ctx.ty_int(),
         ];
         let ty = ctx.ty_struct("OsdiDescriptor", &fields);
         self.osdi_descriptor = Some(ty);