diff --git a/CMakeLists.txt b/CMakeLists.txt
index 2196a893..2903ad9e 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -317,7 +317,7 @@ if (NOT NO_SELFTEST)
     add_test(NAME ListTags COMMAND SelfTest --list-tags)
     set_tests_properties(ListTags PROPERTIES PASS_REGULAR_EXPRESSION "[0-9]+ tags")
 
-    add_test(NAME ApprovalTests COMMAND ${CMAKE_CURRENT_SOURCE_DIR}/scripts/approvalTests.py $<TARGET_FILE:SelfTest>)
+    add_test(NAME ApprovalTests COMMAND python ${CMAKE_CURRENT_SOURCE_DIR}/scripts/approvalTests.py $<TARGET_FILE:SelfTest>)
     set_tests_properties(ApprovalTests PROPERTIES FAIL_REGULAR_EXPRESSION "Results differed")
 endif() # !NO_SELFTEST