diff --git a/regression/cbmc-incr-smt2/Makefile b/regression/cbmc-incr-smt2/Makefile
index 9a5b8bf4195..1c910bce8c3 100644
--- a/regression/cbmc-incr-smt2/Makefile
+++ b/regression/cbmc-incr-smt2/Makefile
@@ -9,7 +9,9 @@ test.z3:
 	@../test.pl -e -p -c "../../../src/cbmc/cbmc --incremental-smt2-solver 'z3 --smt2 -in' --validate-goto-model --validate-ssa-equation"
 
 test.cvc5:
-	@../test.pl -e -p -c "../../../src/cbmc/cbmc --incremental-smt2-solver 'cvc5 --lang=smtlib2.6 --incremental' --validate-goto-model --validate-ssa-equation"
+	@if which cvc5 ; then \
+	  ../test.pl -e -p -c "../../../src/cbmc/cbmc --incremental-smt2-solver 'cvc5 --lang=smtlib2.6 --incremental' --validate-goto-model --validate-ssa-equation" ; \
+	fi
 
 tests.log: ../test.pl test
 
diff --git a/regression/cbmc-output-file/Makefile b/regression/cbmc-output-file/Makefile
index a90c84526a9..7fe769a7e07 100644
--- a/regression/cbmc-output-file/Makefile
+++ b/regression/cbmc-output-file/Makefile
@@ -4,10 +4,14 @@ include ../../src/config.inc
 include ../../src/common
 
 test:
-	@../test.pl -f -e -p -c '../chain.py ../../../src/cbmc/cbmc'
+	@if which cvc5 ; then \
+	  ../test.pl -f -e -p -c '../chain.py ../../../src/cbmc/cbmc' ; \
+	fi
 
 tests.log:
-	@../test.pl -f -e -p -c '../chain.py ../../../src/cbmc/cbmc'
+	@if which cvc5 ; then \
+	  ../test.pl -f -e -p -c '../chain.py ../../../src/cbmc/cbmc' ; \
+	fi
 
 clean:
 	@for dir in *; do \