diff --git a/lib/eventlog/Makefile.in b/lib/eventlog/Makefile.in
index 3a02bd9a3..a71d6faa8 100644
--- a/lib/eventlog/Makefile.in
+++ b/lib/eventlog/Makefile.in
@@ -148,6 +148,8 @@ fuzz:
 
 check: $(TEST_PROGS)
 	@if test X"$(cross_compiling)" != X"yes"; then \
+	    MALLOC_OPTIONS=S; export MALLOC_OPTIONS; \
+	    MALLOC_CONF="abort:true,junk:true"; export MALLOC_CONF; \
 	    LC_ALL=C; export LC_ALL; \
 	    unset LANG || LANG=; \
 	    MALLOC_OPTIONS=S; export MALLOC_OPTIONS; \
diff --git a/lib/iolog/Makefile.in b/lib/iolog/Makefile.in
index 453e3a642..f36ddf69d 100644
--- a/lib/iolog/Makefile.in
+++ b/lib/iolog/Makefile.in
@@ -194,6 +194,8 @@ pvs-log-files: $(POBJS)
 
 fuzz: $(FUZZ_PROGS)
 	@if test X"$(cross_compiling)" != X"yes"; then \
+	    MALLOC_OPTIONS=S; export MALLOC_OPTIONS; \
+	    MALLOC_CONF="abort:true,junk:true"; export MALLOC_CONF; \
 	    echo "fuzz_iolog_legacy: verifying corpus"; \
 	    ./fuzz_iolog_legacy $(srcdir)/regress/corpus/log_legacy/*.log; \
 	    echo "fuzz_iolog_json: verifying corpus"; \
@@ -204,6 +206,8 @@ fuzz: $(FUZZ_PROGS)
 
 check: $(TEST_PROGS) fuzz
 	@if test X"$(cross_compiling)" != X"yes"; then \
+	    MALLOC_OPTIONS=S; export MALLOC_OPTIONS; \
+	    MALLOC_CONF="abort:true,junk:true"; export MALLOC_CONF; \
 	    LC_ALL=C; export LC_ALL; \
 	    unset LANG || LANG=; \
 	    rval=0; \
diff --git a/plugins/python/Makefile.in b/plugins/python/Makefile.in
index ebe755283..d24ad8b0b 100644
--- a/plugins/python/Makefile.in
+++ b/plugins/python/Makefile.in
@@ -222,6 +222,8 @@ fuzz:
 
 check: $(TEST_PROGS)
 	@if test X"$(cross_compiling)" != X"yes"; then \
+	    MALLOC_OPTIONS=S; export MALLOC_OPTIONS; \
+	    MALLOC_CONF="abort:true,junk:true"; export MALLOC_CONF; \
             ./check_python_examples ".libs/python_plugin.so"; \
 	fi
 
diff --git a/plugins/sudoers/Makefile.in b/plugins/sudoers/Makefile.in
index ca9e8dd6a..6e254e885 100644
--- a/plugins/sudoers/Makefile.in
+++ b/plugins/sudoers/Makefile.in
@@ -483,6 +483,8 @@ pvs-studio: $(POBJS)
 
 fuzz: $(FUZZ_PROGS)
 	@if test X"$(cross_compiling)" != X"yes"; then \
+	    MALLOC_OPTIONS=S; export MALLOC_OPTIONS; \
+	    MALLOC_CONF="abort:true,junk:true"; export MALLOC_CONF; \
 	    echo "fuzz_sudoers: verifying corpus"; \
 	    mkdir -p regress/fuzz; \
 	    ./fuzz_sudoers $(top_srcdir)/examples/sudoers $(srcdir)/regress/sudoers/*.in > regress/fuzz/fuzz_sudoers.out 2>&1; \
@@ -495,6 +497,8 @@ fuzz: $(FUZZ_PROGS)
 
 check: $(TEST_PROGS) visudo testsudoers cvtsudoers fuzz
 	@if test X"$(cross_compiling)" != X"yes"; then \
+	    MALLOC_OPTIONS=S; export MALLOC_OPTIONS; \
+	    MALLOC_CONF="abort:true,junk:true"; export MALLOC_CONF; \
 	    LC_ALL=C; export LC_ALL; \
 	    unset LANG || LANG=; \
 	    MALLOC_OPTIONS=S; export MALLOC_OPTIONS; \