diff --git a/recipes/recipes_emscripten/onetbb/build.sh b/recipes/recipes_emscripten/onetbb/build.sh
index 9763c1a546..c1edebe775 100755
--- a/recipes/recipes_emscripten/onetbb/build.sh
+++ b/recipes/recipes_emscripten/onetbb/build.sh
@@ -8,13 +8,6 @@ CFLAGS="${CFLAGS:-}"
 CXXFLAGS="${CXXFLAGS:-}"
 LDFLAGS="${LDFLAGS:-}"
 
-# Disable ucontext-based resumable tasks — ucontext symbols
-# (getcontext/makecontext/swapcontext) are not linkable on WASM.
-# This forces oneTBB to use pthread-based coroutines instead.
-export CFLAGS="$CFLAGS $EM_FORGE_SIDE_MODULE_CFLAGS -D__TBB_RESUMABLE_TASKS_USE_THREADS=1"
-export CXXFLAGS="$CXXFLAGS $EM_FORGE_SIDE_MODULE_CFLAGS -D__TBB_RESUMABLE_TASKS_USE_THREADS=1"
-export LDFLAGS="$LDFLAGS $EM_FORGE_SIDE_MODULE_LDFLAGS"
-
 mkdir -p build
 cd build
 
@@ -27,12 +20,14 @@ emcmake cmake -GNinja \
     -DBUILD_SHARED_LIBS=OFF \
     -DTBB_STRICT=OFF \
     -DTBB_DISABLE_HWLOC_AUTOMATIC_SEARCH=ON \
+    -DEMSCRIPTEN_WITHOUT_PTHREAD=ON \
     -DTBB_EXAMPLES=OFF \
     -DTBB_TEST=OFF \
     -DTBB4PY_BUILD=OFF \
     -DTBBMALLOC_BUILD=ON \
     -DTBBMALLOC_PROXY_BUILD=ON \
     -DTBB_INSTALL=ON \
+    -DCMAKE_C_FLAGS="-Wno-unused-command-line-argument ${CFLAGS}" \
     -DCMAKE_CXX_FLAGS="-Wno-unused-command-line-argument ${CXXFLAGS}" \
     ..
 
diff --git a/recipes/recipes_emscripten/onetbb/build_tests.sh b/recipes/recipes_emscripten/onetbb/build_tests.sh
index 331cba5841..60d8a02667 100755
--- a/recipes/recipes_emscripten/onetbb/build_tests.sh
+++ b/recipes/recipes_emscripten/onetbb/build_tests.sh
@@ -1,19 +1,15 @@
 #!/bin/bash
 set -e
 
-# -pthread must match libtbb.a build; without it the linker rejects
-# --shared-memory and the test binary won't link.
-export CFLAGS="${CFLAGS} -pthread"
-export CXXFLAGS="${CXXFLAGS} -pthread"
-
 emcmake cmake -S tests -B build_tests \
   -DCMAKE_BUILD_TYPE=Release \
   -DCMAKE_PREFIX_PATH="${PREFIX}" \
-  -DCMAKE_FIND_ROOT_PATH="${PREFIX}" \
-  -DCMAKE_CXX_FLAGS="-pthread" \
-  -DCMAKE_EXE_LINKER_FLAGS="-pthread"
+  -DCMAKE_FIND_ROOT_PATH="${PREFIX}"
 
 emmake make -C build_tests -j"${CPU_COUNT}"
 
-echo "Running test..."
+echo "Running TBB threading test..."
 node build_tests/test_onetbb.js
+
+echo "Running TBB malloc test..."
+node build_tests/test_onetbb_malloc.js
diff --git a/recipes/recipes_emscripten/onetbb/recipe.yaml b/recipes/recipes_emscripten/onetbb/recipe.yaml
index 4fff27acd2..d61dee05e0 100644
--- a/recipes/recipes_emscripten/onetbb/recipe.yaml
+++ b/recipes/recipes_emscripten/onetbb/recipe.yaml
@@ -11,7 +11,7 @@ source:
   sha256: f8767b971ec6aea25dde58ae0f593e94e7aa75a739a86f67967012f69e2199b1
 
 build:
-  number: 0
+  number: 1
   script: build.sh
 
 requirements:
diff --git a/recipes/recipes_emscripten/onetbb/tests/CMakeLists.txt b/recipes/recipes_emscripten/onetbb/tests/CMakeLists.txt
index e3a914bd61..e8850d78c9 100644
--- a/recipes/recipes_emscripten/onetbb/tests/CMakeLists.txt
+++ b/recipes/recipes_emscripten/onetbb/tests/CMakeLists.txt
@@ -2,14 +2,12 @@ cmake_minimum_required(VERSION 3.16)
 project(test_onetbb CXX)
 set(CMAKE_CXX_STANDARD 17)
 
-# pthreads are required to match libtbb.a (compiled with -pthread).
-# These flags must be set BEFORE find_package / add_executable so they
-# affect both compilation and linking.
-set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -pthread")
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -pthread")
-set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -pthread")
-
 find_package(TBB CONFIG REQUIRED)
 
+# Test TBB threading library
 add_executable(test_onetbb test_onetbb.cpp)
 target_link_libraries(test_onetbb TBB::tbb)
+
+# Test TBB malloc library (needed by oneDAL)
+add_executable(test_onetbb_malloc test_onetbb_malloc.cpp)
+target_link_libraries(test_onetbb_malloc TBB::tbbmalloc)
diff --git a/recipes/recipes_emscripten/onetbb/tests/test_onetbb_malloc.cpp b/recipes/recipes_emscripten/onetbb/tests/test_onetbb_malloc.cpp
new file mode 100644
index 0000000000..24f97e2a68
--- /dev/null
+++ b/recipes/recipes_emscripten/onetbb/tests/test_onetbb_malloc.cpp
@@ -0,0 +1,46 @@
+#include <tbb/scalable_allocator.h>
+#include <cassert>
+#include <cstdlib>
+#include <iostream>
+#include <cstring>
+
+int main() {
+    // 1. scalable_malloc / scalable_free
+    void* p = scalable_malloc(1024);
+    assert(p != nullptr);
+    std::memset(p, 0xAB, 1024);
+    scalable_free(p);
+
+    // 2. scalable_calloc
+    int* arr = static_cast<int*>(scalable_calloc(100, sizeof(int)));
+    assert(arr != nullptr);
+    for (int i = 0; i < 100; ++i) {
+        assert(arr[i] == 0);
+    }
+    scalable_free(arr);
+
+    // 3. scalable_realloc
+    char* s = static_cast<char*>(scalable_malloc(32));
+    assert(s != nullptr);
+    std::memcpy(s, "hello tbbmalloc", 15);
+    s = static_cast<char*>(scalable_realloc(s, 64));
+    assert(s != nullptr);
+    scalable_free(s);
+
+    // 4. scalable_aligned_malloc / scalable_aligned_free
+    void* ap = scalable_aligned_malloc(256, 64);
+    assert(ap != nullptr);
+    assert(reinterpret_cast<std::uintptr_t>(ap) % 64 == 0);
+    scalable_aligned_free(ap);
+
+    // 5. scalable_posix_memalign
+    void* pp = nullptr;
+    int ret = scalable_posix_memalign(&pp, 64, 128);
+    assert(ret == 0);
+    assert(pp != nullptr);
+    assert(reinterpret_cast<std::uintptr_t>(pp) % 64 == 0);
+    scalable_free(pp);
+
+    std::cout << "tbbmalloc tests passed!" << std::endl;
+    return 0;
+}