diff --git a/contrib/devtools/deterministic-fuzz-coverage/src/main.rs b/contrib/devtools/deterministic-fuzz-coverage/src/main.rs
index c5cf06a1e0d..df52c497639 100644
--- a/contrib/devtools/deterministic-fuzz-coverage/src/main.rs
+++ b/contrib/devtools/deterministic-fuzz-coverage/src/main.rs
@@ -161,6 +161,8 @@ fn deterministic_coverage(
                 "--show-line-counts-or-regions",
                 "--show-branches=count",
                 "--show-expansions",
+                "--show-instantiation-summary",
+                "-Xdemangler=llvm-cxxfilt",
                 &format!("--instr-profile={}", profdata_file.display()),
             ])
             .arg(fuzz_exe)
diff --git a/contrib/devtools/deterministic-unittest-coverage/src/main.rs b/contrib/devtools/deterministic-unittest-coverage/src/main.rs
index 58dbebcce49..2da483aa7ff 100644
--- a/contrib/devtools/deterministic-unittest-coverage/src/main.rs
+++ b/contrib/devtools/deterministic-unittest-coverage/src/main.rs
@@ -104,6 +104,8 @@ fn deterministic_coverage(build_dir: &Path, test_exe: &Path, filter: &str) -> Ap
                 "--show-line-counts-or-regions",
                 "--show-branches=count",
                 "--show-expansions",
+                "--show-instantiation-summary",
+                "-Xdemangler=llvm-cxxfilt",
                 &format!("--instr-profile={}", profdata_file.display()),
             ])
             .arg(test_exe)