diff --git a/configure.in b/configure.in
index b98dcfa282fe08c9e11e2054a1db0708fa2f423c..69dcc5f924809aac66203859dba99577a519e131 100644
--- a/configure.in
+++ b/configure.in
@@ -405,7 +405,7 @@ else
   HAS_LANDMARKS="no"
 fi
 
-# Python 3 (for analysis-scripts)
+# Python 3 (for analysis-scripts, and for several tests: compliance, jcdb, ...)
 ########
 
 AC_MSG_CHECKING(for python3)
@@ -430,6 +430,8 @@ else
   esac
 fi
 
+plugin_use_external(tests,python3)
+
 ############
 # Platform #
 ############
diff --git a/tests/compliance/check-json.i b/tests/compliance/check-json.i
index 20d667917fd4a5df80572fd3c61ec58a71e086d7..c59b0b2c74f7090f056a290caacb42bc506b2a26 100644
--- a/tests/compliance/check-json.i
+++ b/tests/compliance/check-json.i
@@ -1,7 +1,7 @@
 /*run.config
   NOFRAMAC:
-  EXECNOW: python -m json.tool < share/compliance/c11_functions.json >/dev/null
-  EXECNOW: python -m json.tool < share/compliance/glibc_functions.json >/dev/null
-  EXECNOW: python -m json.tool < share/compliance/nonstandard_identifiers.json >/dev/null
-  EXECNOW: python -m json.tool < share/compliance/posix_identifiers.json >/dev/null
+  EXECNOW: python3 -m json.tool < share/compliance/c11_functions.json >/dev/null
+  EXECNOW: python3 -m json.tool < share/compliance/glibc_functions.json >/dev/null
+  EXECNOW: python3 -m json.tool < share/compliance/nonstandard_identifiers.json >/dev/null
+  EXECNOW: python3 -m json.tool < share/compliance/posix_identifiers.json >/dev/null
 */