diff --git a/lib/preprocessor.cpp b/lib/preprocessor.cpp
index e2257db4b..a8bc0719c 100644
--- a/lib/preprocessor.cpp
+++ b/lib/preprocessor.cpp
@@ -459,6 +459,16 @@ static void getConfigs(const simplecpp::TokenList &tokens, std::set<std::string>
                 std::vector<std::string> configs(configs_if);
                 configs.push_back(configs_ifndef.back());
                 ret.erase(cfg(configs, userDefines));
+                std::set<std::string> temp;
+                temp.swap(ret);
+                for (const std::string &c: temp) {
+                    if (c.find(configs_ifndef.back()) != std::string::npos)
+                        ret.insert(c);
+                    else if (c.empty())
+                        ret.insert(configs.empty() ? configs_ifndef.back() : "");
+                    else
+                        ret.insert(c + ";" + configs_ifndef.back());
+                }
                 if (!elseError.empty())
                     elseError += ';';
                 elseError += cfg(configs_ifndef, userDefines);
diff --git a/test/testpreprocessor.cpp b/test/testpreprocessor.cpp
index 25ca848e5..961415ec7 100644
--- a/test/testpreprocessor.cpp
+++ b/test/testpreprocessor.cpp
@@ -81,6 +81,7 @@ private:
         TEST_CASE(error5);
         TEST_CASE(error6);
         TEST_CASE(error7);
+        TEST_CASE(error8); // #10170 -> previous #if configurations
 
         TEST_CASE(setPlatformInfo);
 
@@ -427,6 +428,19 @@ private:
         ASSERT_EQUALS("\nB\n", getConfigsStr(filedata));
     }
 
+    void error8() {
+        const char filedata[] = "#ifdef A\n"
+                                "#ifdef B\n"
+                                "#endif\n"
+                                "#else\n"
+                                "#endif\n"
+                                "\n"
+                                "#ifndef C\n"
+                                "#error aa\n"
+                                "#endif";
+        ASSERT_EQUALS("A;B;C\nA;C\nC\n", getConfigsStr(filedata));
+    }
+
     void setPlatformInfo() {
         Settings settings;
         Preprocessor preprocessor(settings, this);
@@ -2134,7 +2148,7 @@ private:
                                  "#error \"!Y\"\n"
                                  "#endif\n"
                                  "#endif\n";
-        ASSERT_EQUALS("\nX\nY\n", getConfigsStr(filedata2));
+        ASSERT_EQUALS("\nX;Y\nY\n", getConfigsStr(filedata2));
     }
 
     void getConfigsD1() {