diff --git a/config/config.mk b/config/config.mk
index f52607b39aa0..a56b7db47e7a 100644
--- a/config/config.mk
+++ b/config/config.mk
@@ -450,7 +450,7 @@ XPIDL_COMPILE = $(LIBXUL_DIST)/host/bin/host_xpidl$(HOST_BIN_SUFFIX)
 else
 XPIDL_COMPILE = $(LIBXUL_DIST)/bin/xpidl$(BIN_SUFFIX)
 endif
-XPIDL_LINK = $(PYTHON) $(SDK_BIN_DIR)/xpt.py link
+XPIDL_LINK = $(PYTHON) $(LIBXUL_DIST)/sdk/bin/xpt.py link
 
 # Java macros
 JAVA_GEN_DIR  = _javagen
diff --git a/js/src/config/config.mk b/js/src/config/config.mk
index f52607b39aa0..a56b7db47e7a 100644
--- a/js/src/config/config.mk
+++ b/js/src/config/config.mk
@@ -450,7 +450,7 @@ XPIDL_COMPILE = $(LIBXUL_DIST)/host/bin/host_xpidl$(HOST_BIN_SUFFIX)
 else
 XPIDL_COMPILE = $(LIBXUL_DIST)/bin/xpidl$(BIN_SUFFIX)
 endif
-XPIDL_LINK = $(PYTHON) $(SDK_BIN_DIR)/xpt.py link
+XPIDL_LINK = $(PYTHON) $(LIBXUL_DIST)/sdk/bin/xpt.py link
 
 # Java macros
 JAVA_GEN_DIR  = _javagen