diff --git a/CMakeLists.txt b/CMakeLists.txt
index d24fa080ae..90a3f60d34 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -50,6 +50,8 @@ if (EMSCRIPTEN)
     option(LLAMA_BUILD_HTML "llama: build HTML file" ON)
     if (LLAMA_BUILD_HTML)
         set(CMAKE_EXECUTABLE_SUFFIX ".html")
+    else()
+        set(CMAKE_EXECUTABLE_SUFFIX ".cjs")
     endif()
 else()
     if (MINGW)
diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index e556a7773b..2048917675 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -14,6 +14,12 @@ function(llama_build source)
     install(TARGETS ${TEST_TARGET} RUNTIME)
 endfunction()
 
+if (EMSCRIPTEN)
+    set(LLAMA_TEST_LAUNCHER ${CMAKE_CROSSCOMPILING_EMULATOR})
+else()
+    set(LLAMA_TEST_LAUNCHER)
+endif()
+
 function(llama_test target)
     include(CMakeParseArguments)
     set(options)
@@ -38,7 +44,7 @@ function(llama_test target)
     add_test(
         NAME ${TEST_NAME}
         WORKING_DIRECTORY ${LLAMA_TEST_WORKING_DIRECTORY}
-        COMMAND $<TARGET_FILE:${TEST_TARGET}>
+        COMMAND ${LLAMA_TEST_LAUNCHER} $<TARGET_FILE:${TEST_TARGET}>
         ${LLAMA_TEST_ARGS})
 
     set_property(TEST ${TEST_NAME} PROPERTY LABELS ${LLAMA_TEST_LABEL})
@@ -63,10 +69,16 @@ function(llama_test_cmd target)
         set(TEST_NAME ${target})
     endif()
 
+    if (TARGET ${target})
+        set(cmd $<TARGET_FILE:${target}>)
+    else()
+        set(cmd ${target})
+    endif()
+
     add_test(
         NAME ${TEST_NAME}
         WORKING_DIRECTORY ${LLAMA_TEST_WORKING_DIRECTORY}
-        COMMAND ${target}
+        COMMAND ${LLAMA_TEST_LAUNCHER} ${cmd}
         ${LLAMA_TEST_ARGS})
 
     set_property(TEST ${TEST_NAME} PROPERTY LABELS ${LLAMA_TEST_LABEL})
@@ -106,7 +118,7 @@ function(llama_build_and_test source)
     add_test(
         NAME ${TEST_TARGET}
         WORKING_DIRECTORY ${LLAMA_TEST_WORKING_DIRECTORY}
-        COMMAND $<TARGET_FILE:${TEST_TARGET}>
+        COMMAND ${LLAMA_TEST_LAUNCHER} $<TARGET_FILE:${TEST_TARGET}>
         ${LLAMA_TEST_ARGS})
 
     set_property(TEST ${TEST_TARGET} PROPERTY LABELS ${LLAMA_TEST_LABEL})
@@ -248,9 +260,11 @@ if (NOT GGML_BACKEND_DL)
 endif()
 
 # libmtmd
-set(LLAMA_TEST_NAME test-mtmd-c-api)
-llama_build_and_test(test-mtmd-c-api.c)
-target_link_libraries(${LLAMA_TEST_NAME} PRIVATE mtmd)
+if (NOT EMSCRIPTEN) # fails to build under emscripten because mtmd.h is not found
+    set(LLAMA_TEST_NAME test-mtmd-c-api)
+    llama_build_and_test(test-mtmd-c-api.c)
+    target_link_libraries(${LLAMA_TEST_NAME} PRIVATE mtmd)
+endif()
 
 # dummy executable - not installed
 get_filename_component(TEST_TARGET test-c.c NAME_WE)