diff --git a/lldb/test/Shell/SymbolFile/DWARF/dwarf5-lazy-dwo.c b/lldb/test/Shell/SymbolFile/DWARF/dwarf5-lazy-dwo.c
--- a/lldb/test/Shell/SymbolFile/DWARF/dwarf5-lazy-dwo.c
+++ b/lldb/test/Shell/SymbolFile/DWARF/dwarf5-lazy-dwo.c
@@ -3,11 +3,11 @@
 // -gsplit-dwarf is supported only on Linux.
 // REQUIRES: system-linux
 
-// RUN: %clang_host %s -fno-standalone-debug -g \
+// RUN: %clang_host %s -fno-standalone-debug -g -std=c99 \
 // RUN:   -gdwarf-5 -gpubnames -gsplit-dwarf -c -o %t1.o -DONE
-// RUN: %clang_host %s -fno-standalone-debug -g \
+// RUN: %clang_host %s -fno-standalone-debug -g -std=c99 \
 // RUN:   -gdwarf-5 -gpubnames -gsplit-dwarf -c -o %t2.o -DTWO
-// RUN: %clang_host %t1.o %t2.o -o %t
+// RUN: %clang_host %t1.o %t2.o -o %t -std=c99
 // RUN: %lldb %t -o "log enable 'lldb' object" -o "settings set stop-line-count-before 0" \
 // RUN:   -o "b main" -o "run" -o "image lookup -n main -v" -b | FileCheck %s