diff --git a/src/shims/foreign_items/posix.rs b/src/shims/foreign_items/posix.rs
index a4bc7e4726d0..6dc21d15b9f6 100644
--- a/src/shims/foreign_items/posix.rs
+++ b/src/shims/foreign_items/posix.rs
@@ -45,6 +45,11 @@ pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriEvalContextExt<'mir, 'tcx
             }
 
             // File related shims
+            "open" | "open64" => {
+                let result = this.open(args[0], args[1])?;
+                this.write_scalar(Scalar::from_int(result, dest.layout.size), dest)?;
+            }
+
             "fcntl" => {
                 let result = this.fcntl(args[0], args[1], args.get(2).cloned())?;
                 this.write_scalar(Scalar::from_int(result, dest.layout.size), dest)?;
@@ -104,6 +109,11 @@ pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriEvalContextExt<'mir, 'tcx
                 this.write_scalar(Scalar::from_int(result, dest.layout.size), dest)?;
             }
 
+            "lseek" | "lseek64" => {
+                let result = this.lseek64(args[0], args[1], args[2])?;
+                this.write_scalar(Scalar::from_int(result, dest.layout.size), dest)?;
+            }
+
             // Other shims
             "posix_memalign" => {
                 let ret = this.deref_operand(args[0])?;
diff --git a/src/shims/foreign_items/posix/linux.rs b/src/shims/foreign_items/posix/linux.rs
index cf1431c8f117..1c03e3cb1cfe 100644
--- a/src/shims/foreign_items/posix/linux.rs
+++ b/src/shims/foreign_items/posix/linux.rs
@@ -19,21 +19,11 @@ pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriEvalContextExt<'mir, 'tcx
             }
 
             // File related shims
-            "open64" => {
-                let result = this.open(args[0], args[1])?;
-                this.write_scalar(Scalar::from_int(result, dest.layout.size), dest)?;
-            }
-
             "close" => {
                 let result = this.close(args[0])?;
                 this.write_scalar(Scalar::from_int(result, dest.layout.size), dest)?;
             }
 
-            "lseek64" => {
-                let result = this.lseek64(args[0], args[1], args[2])?;
-                this.write_scalar(Scalar::from_int(result, dest.layout.size), dest)?;
-            }
-
             // Time related shims
             "clock_gettime" => {
                 let result = this.clock_gettime(args[0], args[1])?;
diff --git a/src/shims/foreign_items/posix/macos.rs b/src/shims/foreign_items/posix/macos.rs
index d0bb3109424d..bf7146267944 100644
--- a/src/shims/foreign_items/posix/macos.rs
+++ b/src/shims/foreign_items/posix/macos.rs
@@ -19,11 +19,6 @@ pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriEvalContextExt<'mir, 'tcx
             }
 
             // File related shims
-             "open" => {
-                let result = this.open(args[0], args[1])?;
-                this.write_scalar(Scalar::from_int(result, dest.layout.size), dest)?;
-            }
-
             "close$NOCANCEL" => {
                 let result = this.close(args[0])?;
                 this.write_scalar(Scalar::from_int(result, dest.layout.size), dest)?;
@@ -44,11 +39,6 @@ pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriEvalContextExt<'mir, 'tcx
                 this.write_scalar(Scalar::from_int(result, dest.layout.size), dest)?;
             }
 
-            "lseek" => {
-                let result = this.lseek64(args[0], args[1], args[2])?;
-                this.write_scalar(Scalar::from_int(result, dest.layout.size), dest)?;
-            }
-
             // Time related shims
             "gettimeofday" => {
                 let result = this.gettimeofday(args[0], args[1])?;