diff --git a/lib/std/debug/SelfInfo/Elf.zig b/lib/std/debug/SelfInfo/Elf.zig
index 7a81b4cba894fd238d72e5e1c74cdc3df8ae176a..eb60162dcb405709a7468e97ea4b755aaefe2d90 100644
--- a/lib/std/debug/SelfInfo/Elf.zig
+++ b/lib/std/debug/SelfInfo/Elf.zig
@@ -428,6 +428,9 @@ fn findModule(si: *SelfInfo, gpa: Allocator, io: Io, address: usize, lock: enum
     // Rebuild module list with the exclusive lock.
     {
         errdefer si.rwlock.unlock(io);
+        if (si.unwind_cache) |cache| {
+            @memset(cache, .empty);
+        }
         for (si.modules.items) |*mod| {
             unwind: {
                 const u = &(mod.unwind orelse break :unwind catch break :unwind);