diff --git a/backend/go/omnivoice-cpp/CMakeLists.txt b/backend/go/omnivoice-cpp/CMakeLists.txt
index 5d89cefb7..8174b6e08 100644
--- a/backend/go/omnivoice-cpp/CMakeLists.txt
+++ b/backend/go/omnivoice-cpp/CMakeLists.txt
@@ -5,6 +5,12 @@ set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
 
 set(OMNIVOICE_DIR ${CMAKE_CURRENT_SOURCE_DIR}/sources/omnivoice.cpp)
 
+# omnivoice.cpp 3ac485d uses CMAKE_SOURCE_DIR to locate ggml/, which is
+# wrong when omnivoice is nested under add_subdirectory (CMAKE_SOURCE_DIR
+# is the top-level project, not this CMakeLists.txt). Override it here
+# until the upstream fix (ServeurpersoCom/omnivoice.cpp#20) is merged.
+set(GGML_SOURCE_DIR "${OMNIVOICE_DIR}/ggml" CACHE PATH "ggml source tree")
+
 # Override upstream's CMAKE_CUDA_ARCHITECTURES before add_subdirectory.
 if(NOT DEFINED CMAKE_CUDA_ARCHITECTURES)
     set(CMAKE_CUDA_ARCHITECTURES "75-virtual;80-virtual;86-real;89-real")
diff --git a/backend/go/omnivoice-cpp/Makefile b/backend/go/omnivoice-cpp/Makefile
index 7446312f1..1a57f49ef 100644
--- a/backend/go/omnivoice-cpp/Makefile
+++ b/backend/go/omnivoice-cpp/Makefile
@@ -8,7 +8,7 @@ JOBS?=$(shell nproc --ignore=1)
 
 # omnivoice.cpp version
 OMNIVOICE_REPO?=https://github.com/ServeurpersoCom/omnivoice.cpp
-OMNIVOICE_VERSION?=ae9dd24b6a5ff72bf50519490092ad14c64627a8
+OMNIVOICE_VERSION?=3ac485d0688fc684f5dcf2c95283b745220f9dcc
 SO_TARGET?=libgomnivoicecpp.so
 
 CMAKE_ARGS+=-DBUILD_SHARED_LIBS=OFF