diff --git a/App/tools/driver.makefile b/App/tools/driver.makefile
index f8b4c1e..535fa83 100644
--- a/App/tools/driver.makefile
+++ b/App/tools/driver.makefile
@@ -447,7 +447,7 @@ debug::
 install build::
 # Delete old build if INSTBASE has changed and module depends on other modules.
 	@+for ARCH in ${CROSS_COMPILER_TARGET_ARCHS}; do \
-	    echo '$(findmnt -t noautofs -n -o SOURCE --target ${EPICS_MODULES})' | cmp -s O.${EPICSVERSION}_$$ARCH/INSTBASE || \
+	    findmnt -t noautofs -n -o SOURCE --target ${EPICS_MODULES} | cmp -s O.${EPICSVERSION}_$$ARCH/INSTBASE || \
 	    ( grep -qs "^[^#]" O.${EPICSVERSION}_$$ARCH/*.dep && \
 	     (echo "rebuilding $$ARCH"; $(RMDIR) O.${EPICSVERSION}_$$ARCH) ) || true; \
 	done