diff --git a/test/ubsan/TestCases/Pointer/nullptr-and-nonzero-offset-variable.c b/test/ubsan/TestCases/Pointer/nullptr-and-nonzero-offset-variable.c
new file mode 100644
index 0000000..31e63b7
--- /dev/null
+++ b/test/ubsan/TestCases/Pointer/nullptr-and-nonzero-offset-variable.c
@@ -0,0 +1,41 @@
+// RUN: %clang -x c   -fsanitize=pointer-overflow -O0 %s -o %t && %run %t 2>&1 | FileCheck %s --implicit-check-not="error:" --check-prefix=CHECK-UB-C
+// RUN: %clang -x c   -fsanitize=pointer-overflow -O1 %s -o %t && %run %t 2>&1 | FileCheck %s --implicit-check-not="error:" --check-prefix=CHECK-UB-C
+// RUN: %clang -x c   -fsanitize=pointer-overflow -O2 %s -o %t && %run %t 2>&1 | FileCheck %s --implicit-check-not="error:" --check-prefix=CHECK-UB-C
+// RUN: %clang -x c   -fsanitize=pointer-overflow -O3 %s -o %t && %run %t 2>&1 | FileCheck %s --implicit-check-not="error:" --check-prefix=CHECK-UB-C
+
+// RUN: %clang -x c   -fsanitize=pointer-overflow -O0 %s -o %t && %run %t I_AM_UB 2>&1 | FileCheck %s --implicit-check-not="error:" --check-prefix=CHECK-UB
+// RUN: %clang -x c   -fsanitize=pointer-overflow -O1 %s -o %t && %run %t I_AM_UB 2>&1 | FileCheck %s --implicit-check-not="error:" --check-prefix=CHECK-UB
+// RUN: %clang -x c   -fsanitize=pointer-overflow -O2 %s -o %t && %run %t I_AM_UB 2>&1 | FileCheck %s --implicit-check-not="error:" --check-prefix=CHECK-UB
+// RUN: %clang -x c   -fsanitize=pointer-overflow -O3 %s -o %t && %run %t I_AM_UB 2>&1 | FileCheck %s --implicit-check-not="error:" --check-prefix=CHECK-UB
+
+#include <stdint.h>
+#include <stdio.h>
+
+// Just so deduplication doesn't do anything.
+static char *getelementpointer_inbounds_v0(char *base, unsigned long offset) {
+  // Potentially UB.
+  return base + offset;
+}
+static char *getelementpointer_inbounds_v1(char *base, unsigned long offset) {
+  // Potentially UB.
+  return base + offset;
+}
+
+int main(int argc, char *argv[]) {
+  char *base;
+  unsigned long offset;
+
+  base = (char *)0;
+  offset = argc - 1;
+  (void)getelementpointer_inbounds_v0(base, offset);
+  // CHECK-UB: {{.*}}.c:[[@LINE-14]]:15: runtime error: applying non-zero offset 1 to null pointer
+  // CHECK-UB-C: {{.*}}.c:[[@LINE-15]]:15: runtime error: applying zero offset to null pointer
+
+  base = (char *)(intptr_t)(argc - 1);
+  offset = argc == 1 ? 0 : -(argc - 1);
+  (void)getelementpointer_inbounds_v1(base, offset);
+  // CHECK-UB: {{.*}}.c:[[@LINE-16]]:15: runtime error: applying non-zero offset to non-null pointer {{.*}} produced null pointer
+  // CHECK-UB-C: {{.*}}.c:[[@LINE-17]]:15: runtime error: applying zero offset to null pointer
+
+  return 0;
+}
diff --git a/test/ubsan/TestCases/Pointer/nullptr-and-nonzero-offset-variable.cpp b/test/ubsan/TestCases/Pointer/nullptr-and-nonzero-offset-variable.cpp
index 6c84396..2be7020 100644
--- a/test/ubsan/TestCases/Pointer/nullptr-and-nonzero-offset-variable.cpp
+++ b/test/ubsan/TestCases/Pointer/nullptr-and-nonzero-offset-variable.cpp
@@ -1,18 +1,8 @@
-// RUN: %clang -x c   -fsanitize=pointer-overflow -O0 %s -o %t && %run %t 2>&1 | FileCheck %s --implicit-check-not="error:" --check-prefix=CHECK-UB-C
-// RUN: %clang -x c   -fsanitize=pointer-overflow -O1 %s -o %t && %run %t 2>&1 | FileCheck %s --implicit-check-not="error:" --check-prefix=CHECK-UB-C
-// RUN: %clang -x c   -fsanitize=pointer-overflow -O2 %s -o %t && %run %t 2>&1 | FileCheck %s --implicit-check-not="error:" --check-prefix=CHECK-UB-C
-// RUN: %clang -x c   -fsanitize=pointer-overflow -O3 %s -o %t && %run %t 2>&1 | FileCheck %s --implicit-check-not="error:" --check-prefix=CHECK-UB-C
-
 // RUN: %clang -x c++ -fsanitize=pointer-overflow -O0 %s -o %t && %run %t 2>&1 | FileCheck %s --implicit-check-not="error:" --check-prefix=CHECK
 // RUN: %clang -x c++ -fsanitize=pointer-overflow -O1 %s -o %t && %run %t 2>&1 | FileCheck %s --implicit-check-not="error:" --check-prefix=CHECK
 // RUN: %clang -x c++ -fsanitize=pointer-overflow -O2 %s -o %t && %run %t 2>&1 | FileCheck %s --implicit-check-not="error:" --check-prefix=CHECK
 // RUN: %clang -x c++ -fsanitize=pointer-overflow -O3 %s -o %t && %run %t 2>&1 | FileCheck %s --implicit-check-not="error:" --check-prefix=CHECK
 
-// RUN: %clang -x c   -fsanitize=pointer-overflow -O0 %s -o %t && %run %t I_AM_UB 2>&1 | FileCheck %s --implicit-check-not="error:" --check-prefix=CHECK-UB
-// RUN: %clang -x c   -fsanitize=pointer-overflow -O1 %s -o %t && %run %t I_AM_UB 2>&1 | FileCheck %s --implicit-check-not="error:" --check-prefix=CHECK-UB
-// RUN: %clang -x c   -fsanitize=pointer-overflow -O2 %s -o %t && %run %t I_AM_UB 2>&1 | FileCheck %s --implicit-check-not="error:" --check-prefix=CHECK-UB
-// RUN: %clang -x c   -fsanitize=pointer-overflow -O3 %s -o %t && %run %t I_AM_UB 2>&1 | FileCheck %s --implicit-check-not="error:" --check-prefix=CHECK-UB
-
 // RUN: %clang -x c++ -fsanitize=pointer-overflow -O0 %s -o %t && %run %t I_AM_UB 2>&1 | FileCheck %s --implicit-check-not="error:" --check-prefix=CHECK-UB
 // RUN: %clang -x c++ -fsanitize=pointer-overflow -O1 %s -o %t && %run %t I_AM_UB 2>&1 | FileCheck %s --implicit-check-not="error:" --check-prefix=CHECK-UB
 // RUN: %clang -x c++ -fsanitize=pointer-overflow -O2 %s -o %t && %run %t I_AM_UB 2>&1 | FileCheck %s --implicit-check-not="error:" --check-prefix=CHECK-UB
@@ -42,13 +32,11 @@
   offset = argc - 1;
   (void)getelementpointer_inbounds_v0(base, offset);
   // CHECK-UB: {{.*}}.cpp:[[@LINE-17]]:15: runtime error: applying non-zero offset 1 to null pointer
-  // CHECK-UB-C: {{.*}}.cpp:[[@LINE-18]]:15: runtime error: applying zero offset to null pointer
 
   base = (char *)(intptr_t)(argc - 1);
   offset = argc == 1 ? 0 : -(argc - 1);
   (void)getelementpointer_inbounds_v1(base, offset);
-  // CHECK-UB: {{.*}}.cpp:[[@LINE-19]]:15: runtime error: applying non-zero offset to non-null pointer {{.*}} produced null pointer
-  // CHECK-UB-C: {{.*}}.cpp:[[@LINE-20]]:15: runtime error: applying zero offset to null pointer
+  // CHECK-UB: {{.*}}.cpp:[[@LINE-18]]:15: runtime error: applying non-zero offset to non-null pointer {{.*}} produced null pointer
 
   return 0;
 }