diff --git a/CHANGES b/CHANGES
index ee8bb59be54..f642906c556 100644
--- a/CHANGES
+++ b/CHANGES
@@ -16,7 +16,7 @@ Features added
 Bugs fixed
 ----------
 
-* #9917: C++, parse fundamental types no matter the order of simple type
+* #9917: C and C++, parse fundamental types no matter the order of simple type
   specifiers.
 
 Testing
diff --git a/sphinx/domains/c.py b/sphinx/domains/c.py
index 84878cd05f4..6f8a21af5c8 100644
--- a/sphinx/domains/c.py
+++ b/sphinx/domains/c.py
@@ -95,28 +95,18 @@
 _simple_type_specifiers_re = re.compile(r"""(?x)
     \b(
     void|_Bool|bool
-    # Integer
-    # -------
-    |((signed|unsigned)\s+)?(char|(
-        ((long\s+long|long|short)\s+)?int
-    ))
+    |signed|unsigned
+    |short|long
+    |char
+    |int
     |__uint128|__int128
-    # extensions
-    |((signed|unsigned)\s+)?__int(8|16|32|64|128)
-    # Floating-point
-    # --------------
-    |(float|double|long\s+double)(\s+(_Complex|complex|_Imaginary|imaginary))?
-    |(_Complex|complex|_Imaginary|imaginary)\s+(float|double|long\s+double)
+    |__int(8|16|32|64|128)  # extension
+    |float|double
     |_Decimal(32|64|128)
-    # extensions
-    |__float80|_Float64x|__float128|_Float128|__ibm128
-    |__fp16
-    # Fixed-point, extension
-    |(_Sat\s+)?((signed|unsigned)\s+)?((short|long|long\s+long)\s+)?(_Fract|fract|_Accum|accum)
-    # Integer types that could be prefixes of the previous ones
-    # ---------------------------------------------------------
-    |((signed|unsigned)\s+)?(long\s+long|long|short)
-    |signed|unsigned
+    |_Complex|complex|_Imaginary|imaginary
+    |__float80|_Float64x|__float128|_Float128|__ibm128  # extension
+    |__fp16  # extension
+    |_Sat|_Fract|fract|_Accum|accum  # extension
     )\b
 """)
 
@@ -636,8 +626,9 @@ class ASTTrailingTypeSpec(ASTBase):
 
 
 class ASTTrailingTypeSpecFundamental(ASTTrailingTypeSpec):
-    def __init__(self, name: str) -> None:
-        self.names = name.split()
+    def __init__(self, names: List[str]) -> None:
+        assert len(names) != 0
+        self.names = names
 
     def _stringify(self, transform: StringifyTransform) -> str:
         return ' '.join(self.names)
@@ -2580,12 +2571,24 @@ def _parse_nested_name(self) -> ASTNestedName:
                 break
         return ASTNestedName(names, rooted)
 
+    def _parse_simple_type_specifiers(self) -> ASTTrailingTypeSpecFundamental:
+        names: List[str] = []
+
+        self.skip_ws()
+        while self.match(_simple_type_specifiers_re):
+            names.append(self.matched_text)
+            self.skip_ws()
+        if len(names) == 0:
+            return None
+        return ASTTrailingTypeSpecFundamental(names)
+
     def _parse_trailing_type_spec(self) -> ASTTrailingTypeSpec:
         # fundamental types, https://en.cppreference.com/w/c/language/type
         # and extensions
         self.skip_ws()
-        if self.match(_simple_type_specifiers_re):
-            return ASTTrailingTypeSpecFundamental(self.matched_text)
+        res = self._parse_simple_type_specifiers()
+        if res is not None:
+            return res
 
         # prefixed
         prefix = None
diff --git a/tests/test_domain_c.py b/tests/test_domain_c.py
index 0800c505962..60d3fa488eb 100644
--- a/tests/test_domain_c.py
+++ b/tests/test_domain_c.py
@@ -8,6 +8,7 @@
     :license: BSD, see LICENSE for details.
 """
 
+import itertools
 import zlib
 from xml.etree import ElementTree
 
@@ -329,6 +330,13 @@ def signed(t):
         input = "{key}%s foo" % t
         output = ' '.join(input.split())
         check('type', input, {1: 'foo'}, key='typedef', output=output)
+        if ' ' in t:
+            # try permutations of all components
+            tcs = t.split()
+            for p in itertools.permutations(tcs):
+                input = "{key}%s foo" % ' '.join(p)
+                output = ' '.join(input.split())
+                check("type", input, {1: 'foo'}, key='typedef', output=output)
 
 
 def test_domain_c_ast_type_definitions():
diff --git a/tests/test_domain_cpp.py b/tests/test_domain_cpp.py
index 881d911c3c9..5ff8f8e1296 100644
--- a/tests/test_domain_cpp.py
+++ b/tests/test_domain_cpp.py
@@ -144,7 +144,7 @@ def makeIdV2():
         output = "void f(%s arg)" % t
         check("function", input, {1: id1, 2: id2}, output=output)
         if ' ' in t:
-            # try permutations of all commponents
+            # try permutations of all components
             tcs = t.split()
             for p in itertools.permutations(tcs):
                 input = "void f(%s arg)" % ' '.join(p)