diff --git a/src/base/allocator/partition_allocator/src/partition_alloc/aarch64_support.h b/src/base/allocator/partition_allocator/src/partition_alloc/aarch64_support.h
index 600d4ed784..aa9eda75e2 100644
--- a/src/base/allocator/partition_allocator/src/partition_alloc/aarch64_support.h
+++ b/src/base/allocator/partition_allocator/src/partition_alloc/aarch64_support.h
@@ -10,7 +10,9 @@
 #include "partition_alloc/build_config.h"
 #include "partition_alloc/buildflags.h"
 
-#if PA_BUILDFLAG(IS_ANDROID) || PA_BUILDFLAG(IS_LINUX)
+#if defined(__MUSL__)
+// Musl does not support ifunc.
+#elif PA_BUILDFLAG(IS_ANDROID) || PA_BUILDFLAG(IS_LINUX)
 #define HAS_HW_CAPS
 #endif
 
diff --git a/src/base/allocator/partition_allocator/src/partition_alloc/page_allocator_internals_posix.cc b/src/base/allocator/partition_allocator/src/partition_alloc/page_allocator_internals_posix.cc
index 0f2f3514eb..02c3de2e17 100644
--- a/src/base/allocator/partition_allocator/src/partition_alloc/page_allocator_internals_posix.cc
+++ b/src/base/allocator/partition_allocator/src/partition_alloc/page_allocator_internals_posix.cc
@@ -37,8 +37,9 @@ uint32_t SecTaskGetCodeSignStatus(SecTaskRef task) API_AVAILABLE(macos(10.12));
 
 #endif  // PA_BUILDFLAG(IS_MAC)
 
-#if PA_BUILDFLAG(HAS_MEMORY_TAGGING) || \
-    (defined(__ARM_FEATURE_BTI_DEFAULT) && (__ARM_FEATURE_BTI_DEFAULT == 1))
+#if PA_BUILDFLAG(HAS_MEMORY_TAGGING) ||                                        \
+    (defined(__ARM_FEATURE_BTI_DEFAULT) && (__ARM_FEATURE_BTI_DEFAULT == 1) && \
+     !defined(__MUSL__))
 struct __ifunc_arg_t;
 
 #include "partition_alloc/aarch64_support.h"