diff --git a/iso/builder/build-nvidia-module.sh b/iso/builder/build-nvidia-module.sh
index f1ab741..853ba43 100644
--- a/iso/builder/build-nvidia-module.sh
+++ b/iso/builder/build-nvidia-module.sh
@@ -46,7 +46,8 @@ CACHE_DIR="${DIST_DIR}/nvidia-${NVIDIA_VERSION}-${KVER}"
 CACHE_ROOT="${BEE_CACHE_DIR:-${DIST_DIR}/cache}"
 DOWNLOAD_CACHE_DIR="${CACHE_ROOT}/nvidia-downloads"
 EXTRACT_CACHE_DIR="${CACHE_ROOT}/nvidia-extract"
-if [ -d "$CACHE_DIR/modules" ] && [ -f "$CACHE_DIR/bin/nvidia-smi" ]; then
+if [ -d "$CACHE_DIR/modules" ] && [ -f "$CACHE_DIR/bin/nvidia-smi" ] \
+        && [ "$(ls "$CACHE_DIR/lib/libnvidia-ptxjitcompiler.so."* 2>/dev/null | wc -l)" -gt 0 ]; then
     echo "=== NVIDIA cached, skipping build ==="
     echo "cache: $CACHE_DIR"
     echo "modules: $(ls "$CACHE_DIR/modules/"*.ko 2>/dev/null | wc -l) .ko files"
@@ -129,8 +130,10 @@ else
     echo "WARNING: no firmware/ dir found in installer (may be needed for Hopper GPUs)"
 fi
 
-# Copy ALL userspace library files
-for lib in libnvidia-ml libcuda; do
+# Copy ALL userspace library files.
+# libnvidia-ptxjitcompiler is required by libcuda for PTX JIT compilation
+# (cuModuleLoadDataEx with PTX source) — without it CUDA_ERROR_JIT_COMPILER_NOT_FOUND.
+for lib in libnvidia-ml libcuda libnvidia-ptxjitcompiler; do
     count=0
     for f in $(find "$EXTRACT_DIR" -maxdepth 1 -name "${lib}.so.*" 2>/dev/null); do
         cp "$f" "$CACHE_DIR/lib/" && count=$((count+1))
@@ -147,7 +150,7 @@ ko_count=$(ls "$CACHE_DIR/modules/"*.ko 2>/dev/null | wc -l)
 [ "$ko_count" -gt 0 ] || { echo "ERROR: no .ko files built in $CACHE_DIR/modules/"; exit 1; }
 
 # Create soname symlinks: use [0-9][0-9]* to avoid circular symlink (.so.1 has single digit)
-for lib in libnvidia-ml libcuda; do
+for lib in libnvidia-ml libcuda libnvidia-ptxjitcompiler; do
     versioned=$(ls "$CACHE_DIR/lib/${lib}.so."[0-9][0-9]* 2>/dev/null | head -1)
     [ -n "$versioned" ] || continue
     base=$(basename "$versioned")
diff --git a/iso/overlay/usr/local/bin/bee-nvidia-load b/iso/overlay/usr/local/bin/bee-nvidia-load
index 5b182c3..4af1448 100755
--- a/iso/overlay/usr/local/bin/bee-nvidia-load
+++ b/iso/overlay/usr/local/bin/bee-nvidia-load
@@ -100,4 +100,9 @@ if [ -n "$uvm_major" ]; then
     mknod -m 666 /dev/nvidia-uvm-tools c "$uvm_major" 1 || true
 fi
 
+# Refresh dynamic linker cache so that NVIDIA/NCCL libs injected into /usr/lib/
+# are visible to dlopen() calls (libcuda, libnvidia-ptxjitcompiler, libnccl, etc.)
+ldconfig 2>/dev/null || true
+log "ldconfig refreshed"
+
 log "done"