diff --git a/compiler-rt/lib/sanitizer_common/sanitizer_platform_limits_freebsd.cpp b/compiler-rt/lib/sanitizer_common/sanitizer_platform_limits_freebsd.cpp
index 4940062eeae4..4c1e00528923 100644
--- a/compiler-rt/lib/sanitizer_common/sanitizer_platform_limits_freebsd.cpp
+++ b/compiler-rt/lib/sanitizer_common/sanitizer_platform_limits_freebsd.cpp
@@ -29,6 +29,7 @@
 #include <sys/mtio.h>
 #include <sys/ptrace.h>
 #include <sys/resource.h>
+#include <sys/shm.h>
 #include <sys/signal.h>
 #include <sys/socket.h>
 #include <sys/sockio.h>
@@ -87,10 +88,6 @@
 #include <wchar.h>
 #include <wordexp.h>
 
-#define _KERNEL  // to declare 'shminfo' structure
-#include <sys/shm.h>
-#undef _KERNEL
-
 #undef IOC_DIRMASK
 
 // Include these after system headers to avoid name clashes and ambiguities.
@@ -141,8 +138,6 @@ unsigned struct_timeb_sz = sizeof(struct timeb);
 unsigned struct_msqid_ds_sz = sizeof(struct msqid_ds);
 unsigned struct_mq_attr_sz = sizeof(struct mq_attr);
 unsigned struct_statvfs_sz = sizeof(struct statvfs);
-unsigned struct_shminfo_sz = sizeof(struct shminfo);
-unsigned struct_shm_info_sz = sizeof(struct shm_info);
 unsigned struct_regmatch_sz = sizeof(regmatch_t);
 unsigned struct_regex_sz = sizeof(regex_t);
 unsigned struct_fstab_sz = sizeof(struct fstab);
@@ -156,9 +151,6 @@ const uptr sig_err = (uptr)SIG_ERR;
 const uptr sa_siginfo = (uptr)SA_SIGINFO;
 
 int shmctl_ipc_stat = (int)IPC_STAT;
-int shmctl_ipc_info = (int)IPC_INFO;
-int shmctl_shm_info = (int)SHM_INFO;
-int shmctl_shm_stat = (int)SHM_STAT;
 unsigned struct_utmpx_sz = sizeof(struct utmpx);
 
 int map_fixed = MAP_FIXED;
diff --git a/compiler-rt/lib/sanitizer_common/sanitizer_platform_limits_freebsd.h b/compiler-rt/lib/sanitizer_common/sanitizer_platform_limits_freebsd.h
index 8ce73f206fd8..382b67ce78eb 100644
--- a/compiler-rt/lib/sanitizer_common/sanitizer_platform_limits_freebsd.h
+++ b/compiler-rt/lib/sanitizer_common/sanitizer_platform_limits_freebsd.h
@@ -419,12 +419,14 @@ struct __sanitizer_wordexp_t {
 
 typedef void __sanitizer_FILE;
 
-extern unsigned struct_shminfo_sz;
-extern unsigned struct_shm_info_sz;
 extern int shmctl_ipc_stat;
-extern int shmctl_ipc_info;
-extern int shmctl_shm_info;
-extern int shmctl_shm_stat;
+
+// This simplifies generic code
+#define struct_shminfo_sz -1
+#define struct_shm_info_sz -1
+#define shmctl_shm_stat -1
+#define shmctl_ipc_info -1
+#define shmctl_shm_info -1
 
 extern unsigned struct_utmpx_sz;