diff --git a/integration_tests/CMakeLists.txt b/integration_tests/CMakeLists.txt
index d6db445b29..256e27fd0e 100644
--- a/integration_tests/CMakeLists.txt
+++ b/integration_tests/CMakeLists.txt
@@ -311,7 +311,7 @@ RUN(NAME const_03            LABELS cpython llvm c
         EXTRAFILES const_03b.c)
 RUN(NAME const_04            LABELS cpython llvm c)
 RUN(NAME expr_01             LABELS cpython llvm c wasm wasm_x64)
-RUN(NAME expr_01u            LABELS cpython llvm)
+RUN(NAME expr_01u            LABELS cpython llvm c)
 RUN(NAME expr_02             LABELS cpython llvm c wasm wasm_x64)
 RUN(NAME expr_03             LABELS cpython llvm c wasm wasm_x64)
 RUN(NAME expr_04             LABELS cpython llvm c wasm)
diff --git a/src/libasr/codegen/asr_to_c.cpp b/src/libasr/codegen/asr_to_c.cpp
index 0be0354feb..07f34bb157 100644
--- a/src/libasr/codegen/asr_to_c.cpp
+++ b/src/libasr/codegen/asr_to_c.cpp
@@ -316,6 +316,44 @@ class ASRToCVisitor : public BaseCCPPVisitor<ASRToCVisitor>
                     dims = convert_dims_c(t->n_dims, t->m_dims, v_m_type, is_fixed_size);
                     sub = format_type_c(dims, type_name, v_m_name, use_ref, dummy);
                 }
+            } else if (ASRUtils::is_unsigned_integer(*v_m_type)) {
+                headers.insert("inttypes.h");
+                ASR::UnsignedInteger_t *t = ASR::down_cast<ASR::UnsignedInteger_t>(v_m_type);
+                std::string type_name = "uint" + std::to_string(t->m_kind * 8) + "_t";
+                if( is_array ) {
+                    bool is_fixed_size = true;
+                    dims = convert_dims_c(t->n_dims, t->m_dims, v_m_type, is_fixed_size, true);
+                    bool is_struct_type_member = ASR::is_a<ASR::StructType_t>(
+                            *ASR::down_cast<ASR::symbol_t>(v.m_parent_symtab->asr_owner));
+                    if( is_fixed_size && is_struct_type_member ) {
+                        if( !force_declare ) {
+                            force_declare_name = std::string(v.m_name);
+                        }
+                        sub = type_name + " " + force_declare_name + dims;
+                    } else {
+                        std::string encoded_type_name = "u" + std::to_string(t->m_kind * 8);
+                        if( !force_declare ) {
+                            force_declare_name = std::string(v.m_name);
+                        }
+                        generate_array_decl(sub, force_declare_name, type_name, dims,
+                                            encoded_type_name, t->m_dims, t->n_dims,
+                                            use_ref, dummy,
+                                            (v.m_intent != ASRUtils::intent_in &&
+                                            v.m_intent != ASRUtils::intent_inout &&
+                                            v.m_intent != ASRUtils::intent_out &&
+                                            !is_struct_type_member) || force_declare,
+                                            is_fixed_size, false, v.m_abi);
+                    }
+                } else {
+                    bool is_fixed_size = true;
+                    std::string v_m_name = v.m_name;
+                    if( declare_as_constant ) {
+                        type_name = "const " + type_name;
+                        v_m_name = const_name;
+                    }
+                    dims = convert_dims_c(t->n_dims, t->m_dims, v_m_type, is_fixed_size);
+                    sub = format_type_c(dims, type_name, v_m_name, use_ref, dummy);
+                }
             } else if (ASRUtils::is_real(*v_m_type)) {
                 ASR::Real_t *t = ASR::down_cast<ASR::Real_t>(v_m_type);
                 std::string type_name = "float";
diff --git a/src/libasr/codegen/asr_to_c_cpp.h b/src/libasr/codegen/asr_to_c_cpp.h
index 6a919dff14..1073547744 100644
--- a/src/libasr/codegen/asr_to_c_cpp.h
+++ b/src/libasr/codegen/asr_to_c_cpp.h
@@ -394,6 +394,14 @@ R"(#include <stdio.h>
                     case (4) : sub = "int32_t "; break;
                     case (8) : sub = "int64_t "; break;
                 }
+            } else if (ASRUtils::is_unsigned_integer(*return_var->m_type)) {
+                int kind = ASR::down_cast<ASR::UnsignedInteger_t>(return_var->m_type)->m_kind;
+                switch (kind) {
+                    case (1) : sub = "uint8_t "; break;
+                    case (2) : sub = "uint16_t "; break;
+                    case (4) : sub = "uint32_t "; break;
+                    case (8) : sub = "uint64_t "; break;
+                }
             } else if (ASRUtils::is_real(*return_var->m_type)) {
                 bool is_float = ASR::down_cast<ASR::Real_t>(return_var->m_type)->m_kind == 4;
                 if (is_float) {
@@ -1382,6 +1390,12 @@ R"(#include <stdio.h>
                 // src = src;
                 break;
             }
+            case (ASR::cast_kindType::IntegerToUnsignedInteger) : {
+                int dest_kind = ASRUtils::extract_kind_from_ttype_t(x.m_type);
+                src = "(uint" + std::to_string(dest_kind * 8) + "_t)(" + src + ")";
+                last_expr_precedence = 2;
+                break;
+            }
             case (ASR::cast_kindType::ComplexToComplex) : {
                 break;
             }
@@ -1522,6 +1536,10 @@ R"(#include <stdio.h>
         handle_Compare(x);
     }
 
+    void visit_UnsignedIntegerCompare(const ASR::UnsignedIntegerCompare_t &x) {
+        handle_Compare(x);
+    }
+
     void visit_RealCompare(const ASR::RealCompare_t &x) {
         handle_Compare(x);
     }
@@ -1672,6 +1690,10 @@ R"(#include <stdio.h>
         handle_BinOp(x);
     }
 
+    void visit_UnsignedIntegerBinOp(const ASR::UnsignedIntegerBinOp_t &x) {
+        handle_BinOp(x);
+    }
+
     void visit_RealBinOp(const ASR::RealBinOp_t &x) {
         handle_BinOp(x);
     }