diff --git a/Userland/Libraries/LibWeb/Loader/UserAgent.h b/Userland/Libraries/LibWeb/Loader/UserAgent.h
index 0d9fb896163..c0de2d641ee 100644
--- a/Userland/Libraries/LibWeb/Loader/UserAgent.h
+++ b/Userland/Libraries/LibWeb/Loader/UserAgent.h
@@ -20,6 +20,10 @@ namespace Web {
 #    define CPU_STRING "x86"
 #elif ARCH(RISCV64)
 #    define CPU_STRING "RISC-V 64"
+#elif ARCH(PPC64) || ARCH(PPC64LE)
+#    define CPU_STRING "PowerPC 64"
+#elif ARCH(PPC)
+#    define CPU_STRING "PowerPC"
 #else
 #    error Unknown architecture
 #endif