diff --git a/libkmod/libkmod-elf.c b/libkmod/libkmod-elf.c
index 23d27f0..52b0433 100644
--- a/libkmod/libkmod-elf.c
+++ b/libkmod/libkmod-elf.c
@@ -6,7 +6,6 @@
 #include <assert.h>
 #include <elf.h>
 #include <endian.h>
-#include <errno.h>
 #include <limits.h>
 #include <stdlib.h>
 #include <string.h>
@@ -485,7 +484,7 @@ int kmod_elf_get_modinfo_strings(const struct kmod_elf *elf, char ***array)
 
 	*array = a = malloc(total_size);
 	if (*array == NULL)
-		return -errno;
+		return -ENOMEM;
 
 	s = (char *)(a + count + 1);
 	memcpy(s, strings, size);
@@ -561,7 +560,7 @@ int kmod_elf_get_modversions(const struct kmod_elf *elf, struct kmod_modversion
 
 	*array = a = malloc(sizeof(struct kmod_modversion) * count);
 	if (*array == NULL)
-		return -errno;
+		return -ENOMEM;
 
 	for (i = 0, off = sec_off; i < count; i++, off += verlen) {
 		uint64_t crc = elf_get_uint(elf, off, crclen);
@@ -667,7 +666,7 @@ int kmod_elf_strip(const struct kmod_elf *elf, unsigned int flags, const void **
 
 	changed = memdup(elf->memory, elf->size);
 	if (changed == NULL)
-		return -errno;
+		return -ENOMEM;
 
 	ELFDBG(elf, "copied memory to allow writing.\n");
 
@@ -743,7 +742,7 @@ static int kmod_elf_get_symbols_symtab(const struct kmod_elf *elf,
 
 	*array = a = malloc(total_size);
 	if (*array == NULL)
-		return -errno;
+		return -ENOMEM;
 
 	last = 0;
 	for (i = 0, count = 0; i < size; i++) {
@@ -882,7 +881,7 @@ int kmod_elf_get_symbols(const struct kmod_elf *elf, struct kmod_modversion **ar
 
 	*array = a = malloc(sizeof(struct kmod_modversion) * count);
 	if (*array == NULL)
-		return -errno;
+		return -ENOMEM;
 
 	count = 0;
 	str_off = str_sec_off;
@@ -1154,7 +1153,7 @@ int kmod_elf_get_dependency_symbols(const struct kmod_elf *elf,
 	if (*array == NULL) {
 		free(visited_versions);
 		free(symcrcs);
-		return -errno;
+		return -ENOMEM;
 	}
 
 	count = 0;
diff --git a/libkmod/libkmod-file-xz.c b/libkmod/libkmod-file-xz.c
index cafe828..432a647 100644
--- a/libkmod/libkmod-file-xz.c
+++ b/libkmod/libkmod-file-xz.c
@@ -95,7 +95,7 @@ static int xz_uncompress(lzma_stream *strm, struct kmod_file *file)
 			size_t write_size = BUFSIZ - strm->avail_out;
 			char *tmp = realloc(p, total + write_size);
 			if (tmp == NULL) {
-				ret = -errno;
+				ret = -ENOMEM;
 				goto out;
 			}
 			memcpy(tmp + total, out_buf, write_size);
diff --git a/libkmod/libkmod-file-zlib.c b/libkmod/libkmod-file-zlib.c
index db9fc8e..54d6882 100644
--- a/libkmod/libkmod-file-zlib.c
+++ b/libkmod/libkmod-file-zlib.c
@@ -76,7 +76,7 @@ int kmod_file_load_zlib(struct kmod_file *file)
 		if (did == total) {
 			void *tmp = realloc(p, total + READ_STEP);
 			if (tmp == NULL) {
-				ret = -errno;
+				ret = -ENOMEM;
 				goto error;
 			}
 			total += READ_STEP;
diff --git a/libkmod/libkmod-file-zstd.c b/libkmod/libkmod-file-zstd.c
index 8f09459..bd0c8fd 100644
--- a/libkmod/libkmod-file-zstd.c
+++ b/libkmod/libkmod-file-zstd.c
@@ -93,7 +93,7 @@ int kmod_file_load_zstd(struct kmod_file *file)
 	dst_size = frame_size;
 	dst_buf = malloc(dst_size);
 	if (dst_buf == NULL) {
-		ret = -errno;
+		ret = -ENOMEM;
 		goto out;
 	}
 
diff --git a/shared/hash.c b/shared/hash.c
index d0e7f86..6009004 100644
--- a/shared/hash.c
+++ b/shared/hash.c
@@ -140,7 +140,7 @@ int hash_add(struct hash *hash, const char *key, const void *value)
 		size_t size = new_total * sizeof(struct hash_entry);
 		struct hash_entry *tmp = realloc(bucket->entries, size);
 		if (tmp == NULL)
-			return -errno;
+			return -ENOMEM;
 		bucket->entries = tmp;
 		bucket->total = new_total;
 	}
@@ -183,7 +183,7 @@ int hash_add_unique(struct hash *hash, const char *key, const void *value)
 		size_t size = new_total * sizeof(struct hash_entry);
 		struct hash_entry *tmp = realloc(bucket->entries, size);
 		if (tmp == NULL)
-			return -errno;
+			return -ENOMEM;
 		bucket->entries = tmp;
 		bucket->total = new_total;
 	}
diff --git a/tools/opt.c b/tools/opt.c
index 944209b..18a519d 100644
--- a/tools/opt.c
+++ b/tools/opt.c
@@ -32,7 +32,7 @@ int options_from_array(char **args, int nargs, char **output)
 
 		tmp = realloc(opts, optslen + len + qlen + 2);
 		if (!tmp) {
-			err = -errno;
+			err = -ENOMEM;
 			free(opts);
 			opts = NULL;
 			ERR("could not gather module options: out-of-memory\n");