diff --git a/libc/config/linux/api.td b/libc/config/linux/api.td
index 46523b4ca4b8d..a00e0f61b90df 100644
--- a/libc/config/linux/api.td
+++ b/libc/config/linux/api.td
@@ -268,7 +268,7 @@ def SetJmpAPI : PublicAPI<"setjmp.h"> {
 }
 
 def SearchAPI : PublicAPI<"search.h"> {
-  let Types = ["ACTION", "ENTRY", "struct hsearch_data"];
+  let Types = ["ACTION", "ENTRY", "struct hsearch_data", "__lsearchcompare_t"];
 }
 
 def SysStatvfsAPI : PublicAPI<"sys/statvfs.h"> {
diff --git a/libc/spec/posix.td b/libc/spec/posix.td
index d4712dc0c5d70..e354deef340f1 100644
--- a/libc/spec/posix.td
+++ b/libc/spec/posix.td
@@ -1582,7 +1582,8 @@ def POSIX : StandardSpec<"POSIX"> {
     [], // Macros
     [
         ActionType,
-        EntryType
+        EntryType,
+        LSearchCompareT,
     ], // Types
     [], // Enumerations
     [