diff --git a/build-cross.py b/build-cross.py
index 3e303c5..87e32cc 100755
--- a/build-cross.py
+++ b/build-cross.py
@@ -78,7 +78,7 @@ def build_wasi(target):
         run(f"""
             mkdir -p {build_dir}
             cd {build_dir}
-            cmake -DCMAKE_TOOLCHAIN_FILE="{WASI_SDK_PATH}/share/cmake/wasi-sdk.cmake" -DWASI_SDK_PREFIX="{WASI_SDK_PATH}" ../..
+            cmake -GNinja -DCMAKE_TOOLCHAIN_FILE="{WASI_SDK_PATH}/share/cmake/wasi-sdk.cmake" -DWASI_SDK_PREFIX="{WASI_SDK_PATH}" ../..
             cmake --build .
             cp wasm3.wasm ../wasm3-{target['name']}.wasm
             """)
@@ -114,7 +114,7 @@ def build_musl(target):
             export CC="../../{muslcc}"
             export CFLAGS="{target['cflags']}"
             export LDFLAGS="-static -s"
-            cmake -DBUILD_NATIVE=OFF ../..
+            cmake -GNinja -DBUILD_NATIVE=OFF ../..
             cmake --build .
             cp wasm3 ../wasm3-{target['name']}
             """)
diff --git a/source/m3_compile.c b/source/m3_compile.c
index 4e6697a..d253fec 100644
--- a/source/m3_compile.c
+++ b/source/m3_compile.c
@@ -679,8 +679,7 @@ M3Result  PushConst  (IM3Compilation o, u64 i_word, u8 i_type)
         {
             if (IsSlotAllocated (o, slot) and IsSlotAllocated (o, slot + 1))
             {
-                u64 constant;
-                memcpy (&constant, &o->constants [slot - o->slotFirstConstIndex], sizeof (constant));
+                u64 constant = * (u64 *) & o->constants [slot - o->slotFirstConstIndex];
 
                 if (constant == i_word)
                 {
@@ -701,9 +700,9 @@ _                   (Push (o, i_type, slot));
             {
                 u64 constant;
                 if (is64BitType) {
-                    memcpy(&constant, & o->constants [i], sizeof(u64));
+                    constant = * (u64 *) & o->constants [i];
                 } else {
-                    memcpy(&constant, & o->constants [i], sizeof(u32));
+                    constant = * (u32 *) & o->constants [i];
                 }
                 if (constant == i_word)
                 {
@@ -740,10 +739,15 @@ _           (PushAllocatedSlotAndEmit (o, i_type));
 
             d_m3Assert(constTableIndex < d_m3MaxConstantTableSize);
 
-            if (is64BitType) {
-                memcpy (& o->constants [constTableIndex], &i_word, sizeof(u64));
-            } else {
-                memcpy (& o->constants [constTableIndex], &i_word, sizeof(u32));
+            if (is64BitType)
+            {
+                u64 * constant = (u64 *) & o->constants [constTableIndex];
+                * constant = i_word;
+            }
+            else
+            {
+                u32 * constant = (u32 *) & o->constants [constTableIndex];
+                * constant = (u32) i_word;
             }
 
 _           (Push (o, i_type, slot));
diff --git a/source/m3_config.h b/source/m3_config.h
index a7f1532..c2403c2 100644
--- a/source/m3_config.h
+++ b/source/m3_config.h
@@ -62,7 +62,7 @@
 # endif
 
 # ifndef d_m3RecordBacktraces
-#   define d_m3RecordBacktraces                 0
+#   define d_m3RecordBacktraces                 1
 # endif
 
 # ifndef d_m3EnableExceptionBreakpoint