diff --git a/cfg/posix.cfg b/cfg/posix.cfg
index f28469747..c7f37f50b 100644
--- a/cfg/posix.cfg
+++ b/cfg/posix.cfg
@@ -3394,6 +3394,7 @@ The function 'mktemp' is considered to be dangerous due to race conditions and s
     <arg nr="3" direction="in">
       <not-uninit/>
       <not-bool/>
+      <valid>0:2</valid>
     </arg>
   </function>
   <!-- int nanosleep(const struct timespec *rqtp, struct timespec *rmtp); -->
diff --git a/test/cfg/posix.c b/test/cfg/posix.c
index cff20eaf5..5cc3a0360 100644
--- a/test/cfg/posix.c
+++ b/test/cfg/posix.c
@@ -29,6 +29,26 @@
 #include <wchar.h>
 #include <string.h>
 
+void invalidFunctionArg_lseek(int fd, off_t offset, int origin)
+{
+    // cppcheck-suppress invalidFunctionArg
+    (void)lseek(-1, offset, SEEK_SET);
+    // cppcheck-suppress invalidFunctionArg
+    (void)lseek(fd, offset, -1);
+    // cppcheck-suppress invalidFunctionArg
+    (void)lseek(fd, offset, 3);
+    // cppcheck-suppress invalidFunctionArg
+    (void)lseek(fd, offset, 42+SEEK_SET);
+    // cppcheck-suppress invalidFunctionArg
+    (void)lseek(fd, offset, SEEK_SET+42);
+    // No warning is expected for
+    (void)lseek(0, offset, origin);
+    (void)lseek(fd, offset, origin);
+    (void)lseek(fd, offset, SEEK_SET);
+    (void)lseek(fd, offset, SEEK_CUR);
+    (void)lseek(fd, offset, SEEK_END);
+}
+
 void invalidFunctionArg_fseeko(FILE* stream, off_t offset, int origin)
 {
     // cppcheck-suppress invalidFunctionArg