diff --git a/tools/fuzzer/runners/client_fuzzer.sh b/tools/fuzzer/runners/client_fuzzer.sh
index 239d552c57d..97d4e60d908 100644
--- a/tools/fuzzer/runners/client_fuzzer.sh
+++ b/tools/fuzzer/runners/client_fuzzer.sh
@@ -33,7 +33,7 @@ flags="-max_total_time=$runtime -artifact_prefix=fuzzer_output/ -max_len=2048"
 
 if [ "$jobs" != "1" ]
 then
-  flags="-jobs=$jobs -workers=$jobs"
+  flags="-jobs=$jobs -workers=$jobs $flags"
 fi
 
 if [ "$config" == "asan-trace-cmp" ]
diff --git a/tools/fuzzer/runners/hpack_parser_fuzzer_test.sh b/tools/fuzzer/runners/hpack_parser_fuzzer_test.sh
index e69b4b4dfe2..c6f70a623dc 100644
--- a/tools/fuzzer/runners/hpack_parser_fuzzer_test.sh
+++ b/tools/fuzzer/runners/hpack_parser_fuzzer_test.sh
@@ -33,7 +33,7 @@ flags="-max_total_time=$runtime -artifact_prefix=fuzzer_output/ -max_len=512"
 
 if [ "$jobs" != "1" ]
 then
-  flags="-jobs=$jobs -workers=$jobs"
+  flags="-jobs=$jobs -workers=$jobs $flags"
 fi
 
 if [ "$config" == "asan-trace-cmp" ]
diff --git a/tools/fuzzer/runners/http_fuzzer_test.sh b/tools/fuzzer/runners/http_fuzzer_test.sh
index c190ba40b60..bb54a238145 100644
--- a/tools/fuzzer/runners/http_fuzzer_test.sh
+++ b/tools/fuzzer/runners/http_fuzzer_test.sh
@@ -33,7 +33,7 @@ flags="-max_total_time=$runtime -artifact_prefix=fuzzer_output/ -max_len=2048"
 
 if [ "$jobs" != "1" ]
 then
-  flags="-jobs=$jobs -workers=$jobs"
+  flags="-jobs=$jobs -workers=$jobs $flags"
 fi
 
 if [ "$config" == "asan-trace-cmp" ]
diff --git a/tools/fuzzer/runners/json_fuzzer_test.sh b/tools/fuzzer/runners/json_fuzzer_test.sh
index 9fc6271976b..e11e25dc097 100644
--- a/tools/fuzzer/runners/json_fuzzer_test.sh
+++ b/tools/fuzzer/runners/json_fuzzer_test.sh
@@ -33,7 +33,7 @@ flags="-max_total_time=$runtime -artifact_prefix=fuzzer_output/ -max_len=512"
 
 if [ "$jobs" != "1" ]
 then
-  flags="-jobs=$jobs -workers=$jobs"
+  flags="-jobs=$jobs -workers=$jobs $flags"
 fi
 
 if [ "$config" == "asan-trace-cmp" ]
diff --git a/tools/fuzzer/runners/nanopb_fuzzer_response_test.sh b/tools/fuzzer/runners/nanopb_fuzzer_response_test.sh
index bbcebf11cce..97359277ce2 100644
--- a/tools/fuzzer/runners/nanopb_fuzzer_response_test.sh
+++ b/tools/fuzzer/runners/nanopb_fuzzer_response_test.sh
@@ -33,7 +33,7 @@ flags="-max_total_time=$runtime -artifact_prefix=fuzzer_output/ -max_len=128"
 
 if [ "$jobs" != "1" ]
 then
-  flags="-jobs=$jobs -workers=$jobs"
+  flags="-jobs=$jobs -workers=$jobs $flags"
 fi
 
 if [ "$config" == "asan-trace-cmp" ]
diff --git a/tools/fuzzer/runners/nanopb_fuzzer_serverlist_test.sh b/tools/fuzzer/runners/nanopb_fuzzer_serverlist_test.sh
index e9099bac046..2dfaa2372fc 100644
--- a/tools/fuzzer/runners/nanopb_fuzzer_serverlist_test.sh
+++ b/tools/fuzzer/runners/nanopb_fuzzer_serverlist_test.sh
@@ -33,7 +33,7 @@ flags="-max_total_time=$runtime -artifact_prefix=fuzzer_output/ -max_len=128"
 
 if [ "$jobs" != "1" ]
 then
-  flags="-jobs=$jobs -workers=$jobs"
+  flags="-jobs=$jobs -workers=$jobs $flags"
 fi
 
 if [ "$config" == "asan-trace-cmp" ]
diff --git a/tools/fuzzer/runners/server_fuzzer.sh b/tools/fuzzer/runners/server_fuzzer.sh
index 28ca8b32719..fc0567f670b 100644
--- a/tools/fuzzer/runners/server_fuzzer.sh
+++ b/tools/fuzzer/runners/server_fuzzer.sh
@@ -33,7 +33,7 @@ flags="-max_total_time=$runtime -artifact_prefix=fuzzer_output/ -max_len=2048"
 
 if [ "$jobs" != "1" ]
 then
-  flags="-jobs=$jobs -workers=$jobs"
+  flags="-jobs=$jobs -workers=$jobs $flags"
 fi
 
 if [ "$config" == "asan-trace-cmp" ]
diff --git a/tools/fuzzer/runners/uri_fuzzer_test.sh b/tools/fuzzer/runners/uri_fuzzer_test.sh
index 7dac54ec518..5f33e734654 100644
--- a/tools/fuzzer/runners/uri_fuzzer_test.sh
+++ b/tools/fuzzer/runners/uri_fuzzer_test.sh
@@ -33,7 +33,7 @@ flags="-max_total_time=$runtime -artifact_prefix=fuzzer_output/ -max_len=128"
 
 if [ "$jobs" != "1" ]
 then
-  flags="-jobs=$jobs -workers=$jobs"
+  flags="-jobs=$jobs -workers=$jobs $flags"
 fi
 
 if [ "$config" == "asan-trace-cmp" ]