diff --git a/CHANGELOG.md b/CHANGELOG.md
index 64e5f1d63..b7790739e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,7 @@
 
 - The `sentry_attach_file`, `sentry_scope_attach_file` (and their wide-string variants), and `sentry_remove_attachment` have been added to modify the list of attachments that are sent along with sentry events after a call to `sentry_init`. ([#1266](https://github.com/getsentry/sentry-native/pull/1266))
   - NOTE: When using the `crashpad` backend on macOS, the list of attachments that will be added at the time of a hard crash will be frozen at the time of `sentry_init`, and later modifications will not be reflected.
+- Add `sentry_attachment_set_content_type` to allow specifying the content type of attachments. ([#1276](https://github.com/getsentry/sentry-native/pull/1276))
 
 ## 0.9.0
 
diff --git a/include/sentry.h b/include/sentry.h
index 91c584418..a06dbd234 100644
--- a/include/sentry.h
+++ b/include/sentry.h
@@ -1833,6 +1833,12 @@ SENTRY_API sentry_attachment_t *sentry_scope_attach_filew_n(
     sentry_scope_t *scope, const wchar_t *path, size_t path_len);
 #endif
 
+SENTRY_API void sentry_attachment_set_content_type(
+    sentry_attachment_t *attachment, const char *content_type);
+SENTRY_API void sentry_attachment_set_content_type_n(
+    sentry_attachment_t *attachment, const char *content_type,
+    size_t content_type_len);
+
 /* -- Session APIs -- */
 
 typedef enum {
diff --git a/src/sentry_attachment.c b/src/sentry_attachment.c
index b30630774..bafd647d9 100644
--- a/src/sentry_attachment.c
+++ b/src/sentry_attachment.c
@@ -1,6 +1,28 @@
 #include "sentry_attachment.h"
 #include "sentry_alloc.h"
 #include "sentry_path.h"
+#include "sentry_string.h"
+
+void
+sentry_attachment_set_content_type(
+    sentry_attachment_t *attachment, const char *content_type)
+{
+    sentry_attachment_set_content_type_n(
+        attachment, content_type, sentry__guarded_strlen(content_type));
+}
+
+void
+sentry_attachment_set_content_type_n(sentry_attachment_t *attachment,
+    const char *content_type, size_t content_type_len)
+{
+    if (!attachment) {
+        return;
+    }
+
+    sentry_free(attachment->content_type);
+    attachment->content_type
+        = sentry__string_clone_n(content_type, content_type_len);
+}
 
 static void
 attachment_free(sentry_attachment_t *attachment)
@@ -9,6 +31,7 @@ attachment_free(sentry_attachment_t *attachment)
         return;
     }
     sentry__path_free(attachment->path);
+    sentry_free(attachment->content_type);
     sentry_free(attachment);
 }
 
@@ -40,7 +63,7 @@ sentry__attachments_add(sentry_attachment_t **attachments_ptr,
     attachment->path = path;
     attachment->next = NULL;
     attachment->type = attachment_type;
-    attachment->content_type = content_type;
+    attachment->content_type = sentry__string_clone(content_type);
 
     sentry_attachment_t **next_ptr = attachments_ptr;
 
diff --git a/src/sentry_attachment.h b/src/sentry_attachment.h
index cc69263e1..b403b8453 100644
--- a/src/sentry_attachment.h
+++ b/src/sentry_attachment.h
@@ -21,7 +21,7 @@ typedef enum {
 struct sentry_attachment_s {
     sentry_path_t *path;
     sentry_attachment_type_t type;
-    const char *content_type;
+    char *content_type;
     sentry_attachment_t *next;
 };
 
diff --git a/tests/unit/test_attachments.c b/tests/unit/test_attachments.c
index 08eb59086..d3215cb93 100644
--- a/tests/unit/test_attachments.c
+++ b/tests/unit/test_attachments.c
@@ -307,3 +307,60 @@ SENTRY_TEST(attachments_extend)
     sentry__path_free(path_c);
     sentry__path_free(path_d);
 }
+
+SENTRY_TEST(attachment_content_type)
+{
+    SENTRY_TEST_OPTIONS_NEW(options);
+    sentry_init(options);
+
+    sentry_path_t *path_txt
+        = sentry__path_from_str(SENTRY_TEST_PATH_PREFIX ".a.txt");
+    sentry_path_t *path_html
+        = sentry__path_from_str(SENTRY_TEST_PATH_PREFIX ".b.html");
+    sentry_path_t *path_c = sentry__path_from_str(SENTRY_TEST_PATH_PREFIX ".c");
+
+    sentry__path_write_buffer(path_txt, "plain", 5);
+    sentry__path_write_buffer(path_html, "<html/>", 7);
+    sentry__path_write_buffer(path_c, "int main() {}", 13);
+
+    sentry_attachment_t *attachment_txt
+        = sentry_attach_file(SENTRY_TEST_PATH_PREFIX ".a.txt");
+    sentry_attachment_set_content_type(attachment_txt, "text/plain");
+
+    sentry_attachment_t *attachment_html
+        = sentry_attach_file(SENTRY_TEST_PATH_PREFIX ".b.html");
+    sentry_attachment_set_content_type(attachment_html, "text/html");
+
+    sentry_attachment_t *attachment_c
+        = sentry_attach_file(SENTRY_TEST_PATH_PREFIX ".c");
+    sentry_attachment_set_content_type(attachment_c, NULL);
+
+    SENTRY_WITH_SCOPE (scope) {
+        sentry_envelope_t *envelope = sentry__envelope_new();
+        sentry__envelope_add_attachments(envelope, scope->attachments);
+
+        char *serialized = sentry_envelope_serialize(envelope, NULL);
+        TEST_CHECK_STRING_EQUAL(serialized,
+            "{}\n"
+            "{\"type\":\"attachment\",\"length\":5,\"content_type\":\"text/"
+            "plain\","
+            "\"filename\":\".a.txt\"}\nplain\n"
+            "{\"type\":\"attachment\",\"length\":7,\"content_type\":\"text/"
+            "html\","
+            "\"filename\":\".b.html\"}\n<html/>"
+            "\n{\"type\":\"attachment\",\"length\":13,\"filename\":\".c\"}\n"
+            "int main() {}");
+        sentry_free(serialized);
+        sentry_envelope_free(envelope);
+    }
+
+    sentry_close();
+
+    sentry__path_remove(path_txt);
+    sentry__path_remove(path_html);
+    sentry__path_remove(path_c);
+
+    sentry__path_free(path_txt);
+    sentry__path_free(path_html);
+    sentry__path_free(path_c);
+}
diff --git a/tests/unit/tests.inc b/tests/unit/tests.inc
index 56badaefc..abd15deae 100644
--- a/tests/unit/tests.inc
+++ b/tests/unit/tests.inc
@@ -1,6 +1,7 @@
 XX(assert_sdk_name)
 XX(assert_sdk_user_agent)
 XX(assert_sdk_version)
+XX(attachment_content_type)
 XX(attachments_add_dedupe)
 XX(attachments_add_remove)
 XX(attachments_extend)