diff --git a/common/debug.cpp b/common/debug.cpp
index fff040c06..021117ec4 100644
--- a/common/debug.cpp
+++ b/common/debug.cpp
@@ -162,7 +162,11 @@ bool common_debug_cb_eval(struct ggml_tensor * t, bool ask, void * user_data) {
         }
     }
 
-    char src1_str[256] = { 0 };
+    // Buffer must fit `src1->name` (up to GGML_MAX_NAME, which omnivoice
+    // bumps to 128) plus the bracketed shape string. Stay well above the
+    // worst case so -Werror=format-truncation on CI 3rd-party doesn't
+    // reject a write the compiler can't prove is bounded.
+    char src1_str[512] = { 0 };
     if (src1) {
         snprintf(src1_str, sizeof(src1_str), "%s{%s}", src1->name, common_ggml_ne_string(src1).c_str());
     }
diff --git a/tools/omnivoice/CMakeLists.txt b/tools/omnivoice/CMakeLists.txt
index 8cb2091d7..cf965da3f 100644
--- a/tools/omnivoice/CMakeLists.txt
+++ b/tools/omnivoice/CMakeLists.txt
@@ -105,12 +105,13 @@ if(MSVC)
     target_compile_options(omnivoice_lib PRIVATE
         /W4 /wd4100 /wd4505)
 else()
-    # -Wshadow intentionally omitted: omnivoice sources include llama's
-    # private headers + the public ggml-backend.h, neither of which are
-    # shadow-clean upstream. Under -DLLAMA_FATAL_WARNINGS=ON those
+    # -Wshadow / -Wconversion intentionally omitted: omnivoice sources
+    # include llama's private headers (src/llama-arch.h, llama-adapter.h)
+    # and the public ggml-backend.h, none of which are shadow- or
+    # conversion-clean upstream. Under -DLLAMA_FATAL_WARNINGS=ON those
     # warnings escalate to -Werror and break the 3rd-party CI lane.
     target_compile_options(omnivoice_lib PRIVATE
-        -Wall -Wextra -Wconversion
+        -Wall -Wextra
         -Wno-unused-parameter -Wno-unused-function -Wno-sign-conversion)
 endif()