diff --git a/include/pocketpy/common/utils.hpp b/include/pocketpy/common/utils.hpp
index 6b8ebfc0..abf53c0e 100644
--- a/include/pocketpy/common/utils.hpp
+++ b/include/pocketpy/common/utils.hpp
@@ -31,4 +31,6 @@ const inline char* kPlatformStrings[] = {
 #define PK_UNREACHABLE() __builtin_unreachable();
 #endif
 
+#define PK_FATAL_ERROR(...) { fprintf(stderr, __VA_ARGS__); std::abort(); }
+
 }  // namespace pkpy
diff --git a/include/pocketpy/interpreter/vm.hpp b/include/pocketpy/interpreter/vm.hpp
index e55efa28..07a3f32b 100644
--- a/include/pocketpy/interpreter/vm.hpp
+++ b/include/pocketpy/interpreter/vm.hpp
@@ -9,8 +9,6 @@
 #include "pocketpy/interpreter/frame.hpp"
 #include "pocketpy/interpreter/profiler.hpp"
 
-#include <stdexcept>
-
 namespace pkpy {
 
 /* Stack manipulation macros */
@@ -467,15 +465,7 @@ public:
     template <typename T>
     Type _find_type_in_cxx_typeid_map() {
         auto it = _cxx_typeid_map.try_get(typeid(T));
-        if(it == nullptr) {
-#if __GNUC__ || __clang__
-            throw std::runtime_error(__PRETTY_FUNCTION__ + std::string(" failed: T not found"));
-#elif _MSC_VER
-            throw std::runtime_error(__FUNCSIG__ + std::string(" failed: T not found"));
-#else
-            throw std::runtime_error("_find_type_in_cxx_typeid_map() failed: T not found");
-#endif
-        }
+        if(it == nullptr) PK_FATAL_ERROR("T not found in cxx_typeid_map")
         return *it;
     }
 
diff --git a/src/common/any.cpp b/src/common/any.cpp
index d3c76954..6d8558e7 100644
--- a/src/common/any.cpp
+++ b/src/common/any.cpp
@@ -1,14 +1,12 @@
 #include "pocketpy/common/any.hpp"
+#include "pocketpy/common/utils.hpp"
 
-#include <stdexcept>
 #include <cstdio>
 
 namespace pkpy {
 
 void any::__bad_any_cast(const std::type_index expected, const std::type_index actual) {
-    char error[256];
-    snprintf(error, sizeof(error), "bad_any_cast: expected %s, got %s", expected.name(), actual.name());
-    throw std::runtime_error(error);
+    PK_FATAL_ERROR("bad_any_cast: expected %s, got %s", expected.name(), actual.name())
 }
 
 any::any(any&& other) noexcept : data(other.data), _vt(other._vt) {
diff --git a/src/common/memorypool.cpp b/src/common/memorypool.cpp
index bf3d91e2..55ec1f54 100644
--- a/src/common/memorypool.cpp
+++ b/src/common/memorypool.cpp
@@ -4,7 +4,6 @@
 #include <cstdlib>
 #include <cstring>
 #include <cassert>
-#include <stdexcept>
 
 namespace pkpy {
 
diff --git a/src/common/str.cpp b/src/common/str.cpp
index e7aa417a..90664be1 100644
--- a/src/common/str.cpp
+++ b/src/common/str.cpp
@@ -1,7 +1,6 @@
 #include "pocketpy/common/str.hpp"
 #include "pocketpy/common/gil.hpp"
 
-#include <stdexcept>
 #include <cassert>
 #include <ostream>
 #include <algorithm>
@@ -17,7 +16,7 @@ int utf8len(unsigned char c, bool suppress) {
     if((c & 0b11111000) == 0b11110000) return 4;
     if((c & 0b11111100) == 0b11111000) return 5;
     if((c & 0b11111110) == 0b11111100) return 6;
-    if(!suppress) throw std::runtime_error("invalid utf8 char: " + std::to_string(c));
+    if(!suppress) PK_FATAL_ERROR("invalid utf8 char")
     return 0;
 }
 
@@ -380,7 +379,7 @@ StrName StrName::get(std::string_view s) {
     // generate new index
     // https://github.com/python/cpython/blob/3.12/Objects/dictobject.c#L175
     uint16_t index = ((_pesudo_random_index * 5) + 1) & 65535;
-    if(index == 0) throw std::runtime_error("StrName index overflow");
+    if(index == 0) PK_FATAL_ERROR("StrName index overflow")
     auto res = _r_interned().emplace(index, s);
     assert(res.second);
     s = std::string_view(res.first->second);
diff --git a/src/interpreter/frame.cpp b/src/interpreter/frame.cpp
index c15e8e7a..d46e5391 100644
--- a/src/interpreter/frame.cpp
+++ b/src/interpreter/frame.cpp
@@ -1,8 +1,6 @@
 #include "pocketpy/objects/stackmemory.hpp"
 #include "pocketpy/interpreter/frame.hpp"
 
-#include <stdexcept>
-
 namespace pkpy {
 PyVar* FastLocals::try_get_name(StrName name) {
     int index = co->varnames_inv.get(name, -1);
@@ -72,7 +70,7 @@ void Frame::prepare_jump_break(ValueStack* _s, int target) {
         int next_block = co->lines[target].iblock;
         while(i >= 0 && i != next_block)
             i = _exit_block(_s, i);
-        if(i != next_block) throw std::runtime_error("invalid jump");
+        assert(i == next_block);
     }
 }
 
diff --git a/src/objects/namedict.cpp b/src/objects/namedict.cpp
index 28d004bc..0c8ea422 100644
--- a/src/objects/namedict.cpp
+++ b/src/objects/namedict.cpp
@@ -1,7 +1,5 @@
 #include "pocketpy/objects/namedict.hpp"
 
-#include <stdexcept>
-
 namespace pkpy {
 
 #define HASH_PROBE_1(key, ok, i)                                                                                       \
@@ -118,7 +116,7 @@ bool NameDict::contains(StrName key) const {
 
 PyVar NameDict::operator[] (StrName key) const {
     PyVar* val = try_get_2_likely_found(key);
-    if(val == nullptr) { throw std::runtime_error(_S("NameDict key not found: ", key.escape()).str()); }
+    if(val == nullptr) PK_FATAL_ERROR("NameDict key not found: %s", key.escape().c_str())
     return *val;
 }