diff --git a/arch/sparc32/linux_load.c b/arch/sparc32/linux_load.c
index 038cb50..26f7fc6 100644
--- a/arch/sparc32/linux_load.c
+++ b/arch/sparc32/linux_load.c
@@ -461,7 +461,7 @@ static int load_initrd(struct linux_header *hdr, uint32_t kern_end,
     uint64_t forced;
 
     fd = open_io(initrd_file);
-    if (!fd) {
+    if (fd == -1) {
 	printf("Can't open initrd: %s\n", initrd_file);
 	return -1;
     }
@@ -609,8 +609,9 @@ int linux_load(struct sys_info *info, const char *file, const char *cmdline)
     char *initrd_file = NULL;
 
     fd = open_io(file);
-    if (!fd)
+    if (fd == -1) {
 	return -1;
+    }
 
     kern_addr = load_linux_header(&hdr);
     if (kern_addr == 0) {
diff --git a/arch/sparc64/linux_load.c b/arch/sparc64/linux_load.c
index fe61a35..e3afc2d 100644
--- a/arch/sparc64/linux_load.c
+++ b/arch/sparc64/linux_load.c
@@ -461,7 +461,7 @@ static int load_initrd(struct linux_header *hdr, uint32_t kern_end,
     uint64_t forced;
 
     fd = open_io(initrd_file);
-    if (!fd) {
+    if (fd == -1) {
 	printf("Can't open initrd: %s\n", initrd_file);
 	return -1;
     }
@@ -609,7 +609,7 @@ int linux_load(struct sys_info *info, const char *file, const char *cmdline)
     char *initrd_file = NULL;
 
     fd = open_io(file);
-    if (!fd)
+    if (fd == -1)
 	return -1;
 
     kern_addr = load_linux_header(&hdr);
diff --git a/arch/x86/linux_load.c b/arch/x86/linux_load.c
index 9a22dce..e06326b 100644
--- a/arch/x86/linux_load.c
+++ b/arch/x86/linux_load.c
@@ -462,7 +462,7 @@ static int load_initrd(struct linux_header *hdr, struct sys_info *info,
     uint64_t forced;
 
     fd = open_io(initrd_file);
-    if (!fd) {
+    if (fd == -1) {
 	printf("Can't open initrd: %s\n", initrd_file);
 	return -1;
     }
@@ -634,8 +634,9 @@ int linux_load(struct sys_info *info, const char *file, const char *cmdline)
     char *initrd_file = NULL;
 
     fd = open_io(file);
-    if (!fd)
+    if (fd == -1) {
 	return -1;
+    }
 
     kern_addr = load_linux_header(&hdr);
     if (kern_addr == 0)